WASHINGTON – President Donald Trump is traveling to Milwaukee, Wisc., Tuesday to rally supporters in a critical battleground state as six of his Democratic challengers square off on the debate stage for the last time before Iowa's caucuses.
Trump will take the stage at the University of Wisconsin-Milwaukee Panther Arena, two hours before Senators Joe Biden, Elizabeth Warren, Bernie Sanders, Amy Klobuchar and Pete Buttigieg and Tom Steyer make their case at Drake University in Des Moines, Iowa.
The campaign rally comes after House Speaker Nancy Pelosi announced the House would vote Wednesday to send the articles of impeachment against Trump to the Senate, setting the stage for a trial to begin Jan. 21.
Pelosi delayed sending the articles, which accuse Trump of abuse of power and obstruction of Congress, after the House voted to impeach Trump on Dec. 18. She said she wanted to learn more about how the trial would be conducted, including whether witnesses would be called.
The Senate impeachment trial could hobble some of the president's Democratic challengers on the campaign trail before the early voting contest begins. Senators Bernie Sanders, Elizabeth Warren, Amy Klobuchar and Michael Bennett will serve as jurors and will be required to sit for the entirety of the impeachment trial, which will last several hours each day.
Trump has been shadowing Democratic candidates throughout their presidential contest - a practice that will continue as caucuses and primaries begin.

The Trump campaign has scheduled a Jan. 30 rally in Des Moines, Iowa, four days before the caucuses open the Democratic delegate selection process.
Administration officials said they are discussing the possibility of a New Hampshire visit before the Feb. 11 primary in the Granite State.
Trump clinched Wisconsin by less than a percentage point in 2016. But the state has since elected a Democratic governor and moderate suburban Republicans, a large voting bloc in Wisconsin, could serve as swing voters in 2020.
Before the rally the president's son-in-law and senior adviser, Jared Kushner, joined Senator Ron Johnson, R-Wisc., and Ja'Ron Smith, deputy assistant to the president, for a discussion about skills training for former inmates.
This article originally appeared on USA TODAY: Trump rallies supporters in Wisconsin as Democrats hold crucial debate in Iowa