Rick Perry's run for the Republican presidential nomination in 2012 may have been full of blunders, but that hasn't stopped the former Texas Governor from launching another bid for the White House. Perry officially launched his campaign Thursday at a rally in Addison, Texas.

In contrast to the ever-expanding Republican presidential field, former Rhode Island Gov. Lincoln Chafee became just the third official challenger to Democratic front-runner Hillary Clinton on Wednesday.

Despite an intensification of activity this week, Greece and its creditors failed to reach an agreement after crucial talks in Brussels late Wednesday, though both Athens and the European Union claimed to have made progress towards a solution and apparently hope to wrap up the deal by the middle of the month.

Massachusetts Sen. Elizabeth Warren, D-Mass., sent a harshly worded letter to Securities and Exchange Commission Chair Mary Jo White on Tuesday bashing her leadership of the regulatory agency. Warren expressed serious concerns about the SEC's regulatory and enforcement record during White's tenure.

Former President George W. Bush's time away from office seems to have had a positive impact on the way he is perceived by Americans, according to the results of new a CNN/ORC poll. The poll showed that 52 percent of Americans now have a favorable opinion of Bush.

After days of tiring negotiations, Greece and its creditors may be inching towards a permanent, or again a temporary solution, to the crisis that resurrected the specter of a Eurozone break-up capable of spewing chaos and panic in the political and financial landscape across the globe.

After several delays, the Senate voted Tuesday to approve legislation to bring an end to the National Security Agency's bulk data collection program. The Senate voted 67 to 32 in favor of the bill known as the USA Freedom Act, which now heads to President Barack Obama's desk for his signature.

After several delays, the Senate is scheduled to vote later Tuesday on legislation that would bring an end to the National Security Agency's bulk data collection program. The Senate voted 83 to 14 in favor of a measure to limit debate on the bill known as the USA Freedom Act.

While Hillary Clinton remains the clear front-runner in the race for the Democratic presidential nomination, the results of a new CNN/ORC poll show the former Secretary of State's favorability rating has taken a significant hit since she formally launched her campaign.

The protracted negotiations between Greece and its creditors seemingly shifted into top gear this week as the cash-strapped country teeters on the verge of a default with a loan repayment to the International Monetary Fund due at the end of the week.

Senator Lindsey Graham, R-S.C., officially became the latest candidate to join the crowded Republican presidential field on Monday. In a speech in his home state of South Carolina, Graham highlighted his foreign policy experience, arguing that he would be ready to be Commander-in-Chief on his first day in the White House.

While legislation to reform the government's bulk data collection program cleared a procedural hurdle Sunday evening, key provisions of the Patriot Act were still allowed to expire.

Wisconsin Gov. Scott Walker continues to lead among likely Iowa Republican caucus attendees, according to the results of a new Bloomberg Politics/Des Moines Register poll. The poll found that Walker is the first choice among 17 percent of likely Republican caucus attendees.

A U.S. State Department Spokesperson has said Secretary of State John Kerry broke his right femur Sunday in a bicycling accident in Scionzier, France. Given the injury is near the site of his prior hip surgery, Kerry will return to Boston to seek treatment at Massachusetts General Hospital with his doctor who did the prior surgery.

While the Senate remains adjourned for its Memorial Day break, the Democratic leadership released a statement Thursday urging Senate Majority Leader Mitch McConnell, R-Ken., to pursue passage of the bill known as USA Freedom Act.

A crowded Republican presidential field has received two more long-shot candidates, as former Senator Rick Santorum, R-Penn., and former New York Gov. George Pataki have both thrown their hats into the ring.

With the field widening just about every day, the results of a new Quinnipiac University National poll released on Thursday showed there remains no clear front-runner in the race for the Republican presidential nomination.

As part of an effort to cement his environmental legacy, President Barack Obama announced his administration is implementing a new rule to clarify which waters are protected by federal law.

An order issued by a federal judge on Wednesday requires the State Department to release batches of former Secretary of State Hillary Clinton's emails every 30 days. The ruling from U.S. District Court Judge Rudolph Contreras calls for the rolling production of the emails to begin on June 30th.

Vermont Senator Bernie Sanders, I-Vt., formally kicked off his long shot campaign for president at an event in Burlington on Tuesday. Sanders described his campaign as a political revolution to transform the country economically, politically, socially and environmentally.

In a blow to President Barack Obama, a federal appeals court upheld an injunction against the president's controversial executive actions on immigration. A three-judge panel from the 5th U.S. Circuit Court of Appeals in New Orleans issued the 2 to 1 ruling Tuesday afternoon.

Arizona Congresswoman Ann Kirkpatrick, D-Ariz., announced Tuesday she is running for the Senate seat currently held by Sen. John McCain, R-Ariz. Kirkpatrick, a three-term lawmaker from a swing district, could provide a formidable challenge to McCain, who announced plans to run for re-election to a sixth term last month.

Greece's government on Monday ruled out imposing controls over capital flows over the upcoming long weekend, after an opposition lawmaker suggested the move if the country fails to strike a deal with its creditors soon.

Despite the fall of the key Iraqi city of Ramadi, President Barack Obama does not believe the U.S. is losing its fight against the terrorist group known as the Islamic State or ISIS. Obama acknowledged losing Ramadi to ISIS control was a "tactical setback" but argued the city had been vulnerable for a long time.

On the heels of last week's deadly Amtrak train derailment near Philadelphia, a group of Senate Democrats have called for an increase in spending on the publicly funded rail service.

A controversial trade bill cleared a key procedural hurdle in the Senate on Thursday, with most Republicans and a few Democrats voting to limit debate on legislation giving the president the authority to "fast track" trade deals.

Despite the backlash to similar moves in Indiana and Arkansas, Louisiana Gov. Bobby Jindal has issued an executive order that critics claim will allow Louisiana businesses to discriminate against gays and lesbians.

Ahead of a potentially historic ruling by the U.S. Supreme Court, the results of a new Gallup poll show support for same-sex marriage has jumped to a new record high. The poll found that 60 percent of Americans think same-sex marriages should be recognized by law as valid with the same rights as traditional marriages.

Responding to questions from reporters for the first time in several weeks, Hillary Clinton reiterated Tuesday that she wants the emails from her time as Secretary of State to be made public as soon as possible.

Libertarian-leaning Sen. Rand Paul, R-Ken., vowed Tuesday to do "whatever it takes" to stop the Senate from renewing provisions of the Patriot Act the government claims authorize the National Security Agency's bulk data collection program.