WASHINGTON (AP) — President Donald Trump implored Republicans on Monday to help preserve "fragile" GOP victories that could be erased by Democrats as he closes out a midterm campaign that has been defined by his racially charged rhetoric, hard-line immigration moves and scattershot policy proposals.

One day before polls closed, Trump was headed to Ohio, Indiana and Missouri to boost Republican turnout in elections that could determine the path of his presidency. He laid out the stakes Monday in a telephone "town hall" organized by his re-election campaign.

"It's all fragile. Everything I told you about, it can be undone and changed by the Democrats if they get in," Trump said. "You see how they've behaved. You see what's happening with them. They've really become radicalized."

Throughout the fall, Trump has cast an overwhelming shadow over the midterm elections, which will serve as a testing ground for his nationalist appeals and the strength of the coalition that powered him to the White House. In the final days, Trump has accelerated his harsh rhetoric on illegal immigration and lobbed apocalyptic attacks on Democrats. At the same time, he has sought to distance himself from any potential blame if Republicans lose control of the House.

Whatever the outcome, Trump made clear he knew he was on the line.

"Even though I'm not on the ballot, in a certain way I am on the ballot," Trump said in the town hall. "Tomorrow, whether we consider it or not, the press is very much considering it a referendum on me and us as a movement."

Trump also rejected criticism from some Republicans that his immigration rhetoric was turning off the moderate voters they need to win the House.

"These rallies are the best thing we've done," Trump told reporters at the White House on Sunday. "I think that the rallies have really been the thing that's caused this whole big fervor to start and to continue. I have never seen such excitement.

Republicans are increasingly bullish that they will retain control of the Senate, but they face Democratic headwinds in the House. In an interview with The Associated Press last month, Trump said he would not accept blame for a GOP defeat at the polls.

Trump has had a busy campaign schedule in the final stretch of the race, with 11 rallies over six days. In the final stretch, Trump has brought out special guests to join him on the campaign trail. Country singer Lee Greenwood performed Trump favorite "God Bless the U.S.A." in Chattanooga, Tennessee, and was expected to appear Monday with the president in Cape Girardeau, Missouri. Fox News personality Sean Hannity and conservative radio host Rush Limbaugh were also slated to attend.

At his rallies and on Twitter, Trump's closing argument has largely focused on fear — warning, without evidence, that a Democratic takeover would throw the country into chaos, spurring an influx of illegal immigration and a wave of crime.

As he departed Washington on Monday, he said Democrats' "weak stand" on the issue "means nothing but crime." Speaking to a rally crowd in Georgia over the weekend, Trump made ominous references to the "Antifa" far-left-leaning militant groups and a migrant caravan moving slowly toward the U.S.-Mexico border that he has called an "invasion."

With the election approaching, Trump seized on the caravans of Central American migrants to reinforce an immigration message that recalls the racially charged immigration talk of his 2016 campaign. Faced with low Republican enthusiasm, Trump calculated that immigration would again be an animating issue for his base. He also used the confirmation battle for Supreme Court Justice Brett Kavanaugh to stir up his most loyal supporters.

At his rallies, Trump frequently declares that 2018 is the election of "Kavanaugh and the caravan." He has pushed forward with the rallies amid news events that would have halted previous leaders — holding a massive rally the same day a gunman massacred 11 people in a Pittsburgh synagogue.

Trump's rallies typically follow their own sort of script.

The same soundtrack — heavy on Elton John and The Rolling Stones with a little Backstreet Boys and Rihanna thrown in — plays at the same earsplitting decibels. The same red "Make America Great Again" hats dot the crowd, which happily chants along with the greatest hits of the 2016 campaign, including "Lock Her Up," ''Build the Wall" and a derogatory message toward a certain cable news network. Night after night, Trump unleashes grievances against the media, attacks his political foes, showcases his own accomplishments and promises that he alone can achieve the nation's potential.

Though the candidates he has traveled to support often feel like supporting actors in the theater of a Trump rally, the president has more urgently outlined the need for the Republicans to hang onto power. And he has sharpened his attacks on Democrats while playing up doomsday scenarios if they were to gain power.

In recent stops, Trump has directly targeted favorite foes House Minority Leader Nancy Pelosi and U.S. Rep. Maxine Waters and argued that Democrats would plunge the country into Venezuela-like chaos.

Trump's midterm efforts will not stop with his Missouri rally Monday night. He plans to spend Election Day conducting get-out-the-vote interviews with local media at the White House.

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