President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Monday night heaped praise on embattled Sen. Cindy Hyde-Smith (R) on the eve of Mississippi’s nationally watched runoff election, while attacking her Democratic rival as "far-left."

In his first rally of the night, Trump urged voters to not get complacent and to vote for Hyde-Smith in order to boost Republicans' Senate majority. He highlighted Hyde-Smith's unwavering support for his agenda, particularly her vote for Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughTrump faces tricky choice on Supreme Court pick The Hill's 12:30 Report: Trump stokes fears over November election outcome The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' MORE.

Trump headlined two rallies on behalf of Hyde-Smith ahead of Tuesday's runoff to fill the remaining two years of retired Sen. Thad Cochran William (Thad) Thad CochranEspy wins Mississippi Senate Democratic primary Bottom Line Mike Espy announces Mississippi Senate bid MORE’s (R) term in a race that’s become unexpectedly competitive in deep-red Mississippi.

ADVERTISEMENT

Hyde-Smith will square off against former Agriculture Secretary Mike Espy (D), who's vying to become the first black senator in the state since Reconstruction.

“I think it’ll be a very big day for Cindy, but don’t take any chances,” Trump said in Tupelo, Miss., on Monday night. “That’s happened many times before. That never works out well, just assume you have to vote.”

"Cindy is so important, so respected. ... If we win tomorrow, we’ll be at 53-47 seats, which is substantially more than we had."

With growing fears over holding the seat, national Republicans have heavily invested in the race with millions of dollars in advertising. Trump, in addition to Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.), came to stump with Hyde-Smith to drive turnout in a runoff just days after Thanksgiving.

Hyde-Smith has become embroiled in controversy that was sparked by a joke that she’d be “on the front row” if a supporter invited her to a “public hanging.” She has since apologized for the comment, while Espy has denounced it as "harmful" and "hurtful."

It’s brought race to the forefront of the campaign in a state with a history of lynchings and a significant African-American population.

Speaking in Biloxi on Monday night, Trump made several appeals to African-American voters, at one point repeating a line he used on the campaign trail in 2016: “What the hell do you have to lose” by supporting Republicans?

“African-American unemployment has reached the lowest rate ever recorded,” Trump said. “African-American poverty is at an all-time low. Remember what I used to say: What the hell do you have to lose?”

Hyde-Smith has also come under fire for joking about making it more difficult for liberal students to vote as well as over a 2014 photo that resurfaced of her wearing a Confederate hat in a museum.

She’s still favored to prevail on Tuesday, but Democrats have become energized amid an increasingly tightening race.

While showering Hyde-Smith with praise, Trump argued that Espy will vote in "lockstep" with Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.), calling Democrats the "party of caravans and crime."

“Mike Espy would rather protect illegal aliens than people who live in Mississippi and Mississippi workers,” Trump said.

Hours after his comments in Tupelo, in Biloxi, Trump tore into Espy once again, saying that a vote for the Democrat would be a vote for House Minority Leader Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE and Rep. Maxine Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (D-Calif.), who has emerged as a vocal Democratic critic of the president.

“He has not had a great career folks. Check it out,” Trump said. “A vote for Espy is a vote for the Democrat agenda of socialism and open-borders. Espy supported one of the largest tax increases in American history.”

After initial reservations, Trump endorsed Hyde-Smith prior to the Nov. 6 race and held a rally in Southaven, Miss. Neither Hyde-Smith nor Espy won over 50 percent of the vote, which is necessary to avoid a runoff.

Hyde-Smith briefly joined Trump on stage on Monday to thank him for his endorsement and tout her support for “pro-life issues,” defending military and law enforcement and lower taxes.

“I think I’ve given you one big reason to ask for your vote — I’ve stood up for you and you know I’ll continue to stand up for the conservative values of Mississippi,” she said.

Graham, who’s up for reelection in 2020 in deep-red South Carolina, also joined Trump to bolster Hyde-Smith and highlight her vote for Kavanaugh, who’s denied allegations of sexual assault from high school. Graham, a member of the Judiciary Committee, drew headlines for his fierce rhetoric defending Kavanaugh during his testimony.

“When Kavanaugh needed your senator, she was there,” Graham said. “I want you to show up Tuesday. … If you like Kavanaugh, there’s more coming.”

Senate Republican leadership have touted their larger majority as key to pushing through more judicial nominations in the next Congress.

At Monday’s rally, Trump took a victory lap about holding onto the Senate majority, accusing the media of only focusing on Democrats’ takeover in the House. Trump won Mississippi by nearly 18 points in 2016 and remains popular in the state.

For their part, Democrats have grown more optimistic in a state that hasn’t elected a Democrat to the Senate since 1982.

Espy has had his own star power on the campaign trail thanks to visits from Sens. Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.) and Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.), two black senators who are seen as potential 2020 presidential hopefuls.

Espy has also faced his own hurdles, with GOP attacks over a past lobbying contract with a West African despot and previous bribery allegations, though he’s been acquitted of all charges.

The Democrat has been out of office for more than two decades, after serving in Congress from 1987 to 1993, then becoming former President Clinton’s Agriculture secretary.

But Democrats remain cautiously hopeful about pulling off another upset in the Deep South, after Sen. Doug Jones (D) won Alabama’s special Senate election late last year.

-Updated 10:26 p.m.