The United Kingdom is embroiled in its biggest political crisis in decades. On Wednesday evening, members of Parliament in Prime Minister Theresa May's own Conservative Party are casting ballots in a no-confidence vote over her leadership. May needs to win a simple majority of votes from her party's parliamentarians to keep her job.

Here's what you need to know.

Why do members of the prime minister's own party want to sack her?

Leaders from nearly 200 countries, including the United States, are at a big climate conference in Poland this week. They are struggling to agree on rules for how to meet their national promises to reduce greenhouse gas emissions under the Paris climate agreement of 2015. The official U.S. position is making it difficult.

Adult film star Stormy Daniels, who says she had a sexual encounter with Donald Trump more than a decade ago, has been ordered to pay him nearly $293,000 for attorneys' fees and another $1,000 in sanctions after her defamation suit was dismissed.

A scathing report by the Office of the Inspector General revealed that a consulting company hired by U.S. Customs and Border Protection to fill thousands of new jobs to satisfy President Trump's mandate to secure the southern border is "nowhere near" completing its hiring goals and "risks wasting millions of taxpayer dollars."

The recent shooting deaths of two black men by police have reignited protests about police use of force. In both cases, the men had guns and police wrongly mistook them for suspects.

On Thanksgiving night, a white police officer fatally shot 21-year-old Emantic Bradford Jr. at a mall in Hoover, Ala., a Birmingham suburb. Bradford and others were running from a shooting that left two people injured. Some witnesses said during the pandemonium that followed, some of those running away pulled out their guns for their own protection. Police later said Bradford was not an assailant.

As the U.S. government investigates the breach of Marriott's Starwood chain hotel reservation system, it appears Chinese state hackers are mostly likely responsible for the data breach. The information of about 500 million customers worldwide was exposed.