So far, 28 of the 31 moderate Democrats who represent districts that President Trump won in 2016 have announced they will back Trump's impeachment on Wednesday, despite fears that their votes could put their seats at risk in 2020.

The big picture: Democratic members and committee staffers told Axios' Alayna Treene they expect four to six moderate Democrats to break ranks and vote against the articles.

Democrats from Trump districts supporting at least one article of impeachment:

Undecided Democrats representing Trump districts:

Ron Kind, Wis. 3rd (Even)

Of note: Rep. Jared Golden (D-Maine), who represents a district Trump won by 2 points in 2016, will vote on the article of impeachment for abuse of power, but not the article for obstruction of Congress, according to Bangor Daily News.

The other side: A White House official told Axios' Jonathan Swan that New Jersey Rep. Jefferson Van Drew, who plans to oppose the articles of impeachment, will leave the Democratic Party to become a Republican. Van Drew has long opposed impeachment, and Trump won his district in 2016 by nearly 5 points.

As a conservative Democrat, Minnesota's 7th District Rep. Collin Peterson said he will not vote for the articles unless new information convinces him otherwise. Peterson also said he's been approached to join the Republican Party, but plans to remain a Democrat, according to Newsweek.

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Editor's note: This post has been corrected to reflect the fact that Antonio Delgado represents New York's 19th district (not the 17th).