A Republican congressman targeted by Democrats in his reelection race is distancing himself from GOP presidential nominee Donald TrumpDonald John TrumpReporters defend CNN's Acosta after White House says he 'disrespected' Trump with question Security costs of Trump visit to Scotland sparks outrage among Scottish citizens Ex-CIA officer: Prosecution of Russians indicted for DNC hack 'ain't ever going to happen' MORE in a new ad.

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In "Country First," four-term incumbent Rep. Mike Coffman (Colo.), who is in the middle of a heated contest, looks straight into the camera and says he doesn't much care for Trump. 

"People ask me, 'What do you think about Trump?' Honestly, I don't care for him much," he said. 

In recent days, Trump has faced backlash for attacking a Gold Star family, refusing to endorse Speaker Paul RyanPaul Davis RyanFive GOP lawmakers mulling bid to lead conservative caucus On The Money — Sponsored by Prudential — Trump walks back criticism of UK Brexit strategy | McConnell worries US in 'early stages' of trade war | US trade deficit with China hits new record Tampons sent to Dem who called for free feminine hygiene products in House MORE (R-Wis.) in his primary and making other controversial remarks

Republicans who have long been concerned about the impact Trump could have on down ballot races now face the decision of fleeing or supporting their party's nominee after a week marred with controversy. 

Coffman is seeking to fend off a Democratic opponent in what's considered to be a tossup race as Democrats look to regain control of the House. 

Coffman, a Marine and Army veteran who fought in Iraq, went on to say he will "stand up" to Trump if both are elected. 

"I'm a Marine. For me, country comes first. My duty is always to you. So if Donald Trump is president, I'll stand up to him. Plain and simple." 

The campaign of Democrat Morgan Carrol, who is challenging Coffman for his House seat, issued a statement calling the ad "desperate." 

"Mike Coffman is still voting for Donald Trump who denigrates women, people with disabilities, immigrants, and the military. If he wasn't going to vote for this bully, he would have already said so. This desperate ad is definition Washington and the height of political double-speak – and it proves that Mike Coffman doesn't have the moral conviction to denounce Trump's candidacy."

Sen. Mark KirkMark Steven KirkThis week: Trump heads to Capitol Hill Trump attending Senate GOP lunch Tuesday High stakes as Trump heads to Hill MORE, a vulnerable Republican who's running for reelection in Illinois, similarly denounced Trump in a campaign ad in June.