MINNEAPOLIS — President Donald Trump is trying to convert the impeachment investigation in Washington into a political asset, with three reelection rallies over eight days.

The rally set for Thursday night in Minneapolis was the first since Democrats began proceedings two weeks ago to remove him from office. It will serve as a proving ground for the president as he tries to use the impeachment inquiry to energize supporters for his 2020 campaign.

The rally, scheduled before House Speaker Nancy Pelosi, D-Calif., announced the impeachment investigation, comes at a pivotal moment for Trump. His campaign strategy is focused on motivating his core supporters, rather than trying to win over a diminishing number of undecided voters, and the resonance of his appeal to the faithful may determine his second-term chances.

Trump has lashed out in acerbic tweets and public statements at Democrats, the media and even some Republicans as impeachment has dominated the national headlines. He has claimed that he is the victim of a “coup,” although impeachment is a constitutional process, and accused Democrats of trying to undo the 2016 election.

White House officials expected Trump to echo those themes in Minnesota, much as he tried to paint himself as the victim during special counsel Robert Mueller’s Russia investigation.

Polls show Americans’ support for removing him from office has ticked up since House Democrats launched the impeachment inquiry.

His GOP allies have launched a countrywide campaign to try to reverse that trend and inflict political pain on vulnerable Democrats who are supporting the House investigation.

Both Democrats and Republicans are tuned in to the symbolism of the moment.

The rally at Target Center, the city’s basketball arena, was expected to draw thousands of supporters as well as protesters outside. Trump was to be joined by Vice President Mike Pence, who had a separate schedule of appearances in the state Trump is trying to tip his way next year.

Trump fell about 45,000 votes short of beating Democrat Hillary Clinton statewide in 2016. He has had staff in the state since June building a network to turn out supporters next November.

Attacks on the “socialist” wing of the Democratic Party are the heart of Trump’s plan to hold onto the Rust Belt and become the first Republican presidential candidate to carry Minnesota since Richard Nixon in 1972.

But the state has additional significance as the home of Rep. Ilhan Omar, the Somali-American lawmaker whom Trump often holds up as a symbol of the liberal shift in her party.

Trump has tweeted that Omar should “go back” to her home country if she wants to criticize the United States, and Trump supporters broke into chants of “Send her back!” at a rally this summer in North Carolina. Both incidents drew widespread condemnation from otherwise stalwart Trump supporters, who called the chants racist and urged the president to condemn them.

Some lawmakers, including Senate Majority Leader Mitch McConnell, R-Ky., and some of the president’s closest outside advisers privately warned Trump about the damage those chants could inflict on the GOP, according to four Republicans close to the White House who were not authorized to publicly discuss private conversations.

They believed the sight of thousands of mostly white attendees chanting “Send her back!” would dominate news coverage and turn off moderate voters, particularly women and suburban residents.

Trump has held four rallies since then. The chant has not erupted.

Now advisers fear the restraint won’t last as Trump, already angered by the impeachment probe, headed to Omar’s district.

On Friday, Trump planned a rally in Louisiana against Democratic Gov. John Bel Edwards. Aides said Trump is not endorsing one of the GOP candidates in the race before Saturday’s election to maximize the chances that Edwards falls below the 50 percent threshold needed to avoid a runoff.

Next week Trump is set to hold a rally in Dallas, a GOP stronghold in a state that has grown more competitive for Democrats in recent cycles.