McCain warns Trump he'll fight on lifting Russian sanctions
© Greg Nash
"For the sake of America’s national security and that of our allies, I hope President Trump will put an end to this speculation and reject such a reckless course," McCain said in a statement Friday. "If he does not, I will work with my colleagues to codify sanctions against Russia into law." 
Trump is scheduled to speak with Russian President Vladimir Putin on Saturday, the first time the two men will talk on the phone since last week's inauguration. 
Top Trump adviser Kellyanne Conway told Fox News on Friday morning that lifting sanctions on Moscow was "under consideration."
Any move to lift sanctions would likely spark bipartisan backlash on Capitol Hill. 
McCain added Friday that Trump should remember that the previous three administrations had "high hopes" for bettering the U.S.-Russian relationship and failed because "Putin wants to be our enemy." 
“[Trump] should remember that the man on the other end of the line is a murderer and a thug who seeks to undermine American national security interests at every turn," he added. "For our commander-in-chief to think otherwise would be naïve and dangerous.”
"I would encourage the president to reject this course of action," he said, adding that lifting sanctions without a change in Russian behavior would send a "dangerous message."
Trump's warmer stance toward Moscow has drawn bipartisan criticism throughout the presidential campaign, with Sen. Marco RubioMarco Antonio RubioFlorida questions Senate chairman over claim that Russians have ‘penetrated’ election systems A paid leave plan cannot make you choose between kids or retirement New sanctions would hurt Russia — but hurt American industry more MORE (R-Fla.) grilling Rex Tillerson, nominated to lead the State Department, over his support for Russia sanctions during his confirmation hearing.
McCain outlined on Friday why he believes Trump should oppose lifting sanctions, including Moscow's support for Syrian President Bashar Assad, invading Ukraine, and Putin's push for NATO to reduce its presence in eastern Europe. 

“In just the last three years under Vladimir Putin, Russia has invaded Ukraine, annexed Crimea, threatened NATO allies, and intervened militarily in Syria, leaving a trail of death, destruction, and broken promises in his wake," he said. 

The U.S. intelligence community has publicly blamed Russia for hacking Democratic groups during the election, leading to damaging leaks. A declassified report showed the intelligence community believes the Kremlin interfered in the election specifically to get Trump elected.

Russian leaders have denied any involvement in the election. Trump dismissed the intelligence community's conclusions for weeks after the election. He acknowledged earlier this month that Moscow was likely behind the hacks, but emphasized blaming the Democratic groups for not securing their data.

Trump frequently talked on the campaign trail of wanting warmer relations with Russia. His general election opponent, Democrat Hillary ClintonHillary Diane Rodham ClintonHillicon Valley: FBI fires Strzok after anti-Trump tweets | Trump signs defense bill with cyber war policy | Google under scrutiny over location data | Sinclair's troubles may just be beginning | Tech to ease health data access | Netflix CFO to step down Signs grow that Mueller is zeroing in on Roger Stone Omarosa claims president called Trump Jr. a 'f--- up' for releasing Trump Tower emails MORE, was a harsh critic of Putin.

This story was updated at 1:49 p.m.