Domenico Montanaro

More Americans disapprove than approve of President Trump's handling of the situation with Iran, according to a new NPR/PBS NewsHour/Marist Poll. But they are split along party lines, and the results largely reflect the president's approval rating.

By a 49%-42% margin, Americans disapprove of Trump's handling of Iran. Usual splits emerge, with roughly 9 in 10 Republicans approving, more than 8 in 10 Democrats disapproving and about half of independents disapproving.

There are now no more official debates before Democrats begin voting.

Tuesday night's debate was the last before the Iowa caucuses on Feb. 3, and it featured six of the 12 remaining candidates — the top four of whom polls show to be neck and neck.

Democratic primary voters got a substantive debate in which the candidates clashed over what it means to be commander in chief, gender politics and, of course, health care.

Here are four takeaways from Tuesday night's debate:

Democrats all want one thing: to beat Donald Trump.

The problem is, they can't agree on who's best to do that. With a month to go until the Iowa caucuses, there's a clear top tier of four candidates: former Vice President Joe Biden, Vermont Sen. Bernie Sanders, Massachusetts Sen. Elizabeth Warren and Pete Buttigieg, former mayor of South Bend, Ind.

Whether you think the new decade starts at midnight Tuesday or a year from then, the eve of 2020 seems like a good time to look back on the top political stories of the 2010s.

An overarching and important theme of 2019 was the shifting power dynamic in Washington. The 2018 midterm elections put Democrats in control of the House of Representatives after eight years of Republican control — and made Nancy Pelosi House speaker for the second time in her career.

That had consequences, including the use of the ultimate check on presidential authority, impeachment.

Listen to The NPR Politics Podcast here.

The impeachment of President Trump has dominated the news this week. But the political focus shifted to the Democratic presidential candidates Thursday night for their sixth debate, this one in Los Angeles and hosted by the PBS NewsHour and Politico.

President Trump was impeached Wednesday night on two articles of impeachment — one for abuse of power, the other for obstruction of Congress. And they both got more votes than either of the other two impeachments in American history.

Surprise, surprise. Americans' views of impeachment are split and largely unchanged, according to a new NPR/PBS NewsHour/Marist Poll.

With the House expected to impeach President Trump by the end of the week, and after hours upon hours of congressional testimony, 48% of the country opposes impeachment, while 47% supports it.

Former Vice President Joe Biden and Vermont Sen. Bernie Sanders lead the crowded Democratic field, pulling in together about half of the support of Democratic voters and Democratic-leaning independents, according to the latest NPR/PBS NewsHour/Marist Poll.

Biden leads with 24%, followed closely by Sanders at 22%. Massachusetts Sen. Elizabeth Warren is third with 17%, followed by South Bend, Ind., Mayor Pete Buttigieg at 13%, all together making up a clear top tier of four candidates.