Eight Republican senators on Thursday urged President Trump to take a harder line on Russia, days after he made controversial comments about Russian President Vladimir Putin decried by many as un-American.

“We write to ask you to pursue a results-oriented, but tough-minded and principled policy toward the Russian Federation,” the lawmakers wrote in a letter to Trump.

“While we should seek common ground with Russia in the areas of mutual interest, we must never pursue cooperation with Russia at the expense of our fundamental interests of defending our allies and promoting our values.”

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Signees included Sens. Cory Gardner Cory Scott GardnerHouse approves bill to secure internet-connected federal devices against cyber threats Congress needs to finalize space weather bill as solar storms pose heightened threat Trump courts Florida voters with moratorium on offshore drilling MORE (Colo.), James Inhofe James (Jim) Mountain InhofeWhen 'Buy American' and common sense collide Five things to watch in talks on massive defense bill Overnight Defense: US, Russia trade blame over Syria incident | Pentagon calls out China's 'counterproductive' military exercises, missile test | Democrats press Esper on COVID-19 response MORE (Okla.), Todd Young Todd Christopher YoungWhy the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump Republicans dismiss Trump proposal to delay election MORE (Ind.), Rob Portman Robert (Rob) Jones PortmanRomney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery House passes B bill to boost Postal Service MORE (Ohio), Mike Rounds (S.D.), Joni Ernst (Iowa), Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (Maine) and Lindsey Graham Lindsey Olin GrahamSenate Republicans signal openness to working with Biden Loeffler calls for hearing in wake of Netflix's 'Cuties' Quinnipiac poll shows Graham, Harrison tied in South Carolina Senate race MORE (S.C.).

They urged the president to take steps to counter continued Russian aggression in eastern Ukraine, following the 2014 annexation of the Crimean peninsula, and maintain the current sanctions regime until Russia withdraws from the country.

They also pressed the president not to enter into any diplomatic or military agreements with Moscow as long as Russia supports Syrian President Bashar Assad in the ongoing conflict in that country.

Trump has said that the U.S. and Russia should cooperate to fight the Islamic State in Iraq and Syria (ISIS). Officials and national security experts have argued that such a proposal is fanciful, saying Russia’s primary goal is to maintain influence in the region by propping up the Assad regime.

For example, few Russian airstrikes in the region have been against ISIS targets.

“It is plainly evident that despite Russian claims to the contrary, Moscow’s main goal is not the defeat of the Islamic State, but the preservation of the Assad regime at any cost,” the lawmakers wrote Thursday, using an alternate name for the terror group.

They urged “a firm response” to Russian attempts to interfere in the U.S. elections — including “diplomatic actions, economic consequences, as well as a strengthened military posture in Europe.”

“Most importantly, we urge you to relay to Moscow that the values of democracy, human rights, transparency, and accountability are central to U.S. foreign policy, that these values are non-negotiable, and that the United States will continue to advance these values globally, including with regard to Russia."

Trump throughout the campaign and since he was inaugurated has alarmed Republicans with his warm attitude toward Russia.

Those fears turned to outrage last weekend when the president downplayed contract killings ordered by Putin.

During an interview that aired Sunday night, Fox News host Bill O'Reilly pressed Trump on the issue, saying: “But he's a killer though. Putin's a killer.”

“There are a lot of killers. We've got a lot of killers. What, you think our country is so innocent?” Trump responded.

The comments drew swift condemnation from both sides of the aisle.

"It's really incredible that the president of the United States would equate the greatest nation on earth, that has the greatest record of helping people on earth, with that of Vladimir Putin, who is a butcher and a killer,” Sen. John McCain John Sidney McCainKelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks Trump pulls into must-win Arizona trailing in polls MORE (R-Ariz.) said on CNN Thursday.

The White House has attempted to soothe jangled nerves, arguing that Trump's comments were an affirmation of the president’s desire to begin a new relationship with Russia — not a statement of moral equivalency.

"Rather what the president is seeking to do is to begin anew, a relationship with the people of Russia and with their leadership to say, 'Are there ways that we can begin to work together?'” Vice President Mike Pence Michael (Mike) Richard PenceGOP short of votes on Trump's controversial Fed pick Pence seeks to boost Daines in critical Montana Senate race The Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy MORE told Fox News earlier this week.