President Donald Trump will address another packed house on Saturday night, beginning at 6:30 p.m. Eastern.

He is campaigning in favor of GOP state Sen. Troy Balderson ahead of a key special House election on Tuesday.

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Balderson is running against Democrat Danny O’Connor; polls are so far suggesting the race is close ahead of the election on August 7 that will decide who replaces retired Rep. Pat Tiberi.

Here’s how CNN (tellingly) framed the Saturday night appearance by Trump: “A Monmouth University poll released this week shows a tight race, with Balderson receiving 44 percent support to O’Connor’s 43 percent, with 11 percent of respondents saying they are undecided. Trump’s visit in the closing days of the campaign is a clear attempt by Republicans to rally base voters to Balderson, hoping that the president can charge turnout in the Republican-leaning district.”

Here’s how Trump himself tweeted about the Ohio event:

Nearly 9,000 Trump supporters packed an arena in Wilkes-Barre this past Thursday night in Pennsylvania to hear the president’s remarks in favor of Rep. Lou Barletta in his bid against Democrat Sen. Bob Casey.

It was part pep rally and part public thank-you and acknowledgment to the voters who helped put him — Trump — in the White House in the fall of 2016, and on whose support he and the Republican Party are counting in this year’s fall midterm elections.

Related: Thanks to Trump, Look Who’s Voting Republican Now

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The president also held a rally earlier in the week, in Tampa, Florida.

Watch our livestream of the Saturday night event here: