MSNBC's Rachel Maddow suggested on Monday that Russian President Vladimir Putin has dirt on President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and that Trump is working in the interest of Russia instead of the United States.

In a monologue following the leaders' controversial summit in Helsinki, Finland, Maddow said Putin having dirt on Trump would be the "worst-case scenario" for Americans but that people must prepare for it to be true.

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"There is no reason for any of those [Trump campaign connections to Russia]. Unless you were willing to believe the worst. And who wants to believe the worst? You don’t want to think too hard about the worst-case scenario," Maddow said.

"If the worst case is true, for everything that we’ve been through as a country, for every kind of trial and challenge and intrigue and embarrassment and scandal that we have been through as a nation, we haven’t ever had to reckon with the possibility that somebody has ascended to the presidency of the United States to serve the interests of another country rather than our own," Maddow continued.

Trump has repeatedly denied any collusion with Russia during the 2016 presidential race and said on the campaign trail that he is not a "puppet" for Putin.

However, Maddow and Democratic leaders — including Senate Minority Leader Charles Schumer (N.Y.) and House Minority Leader Nancy Pelosi (Calif.) — have suggested that Trump refusing to denounce Russia's 2016 election meddling during his summit on Monday is evidence Russia has something on him.

On Friday, special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE indicted 12 Russian intelligence officers for allegedly hacking Democratic officials and entities during the 2016 race.

Many had called on Trump to confront Putin about the indictments during their summit.

Instead, Trump said during the news conference that he doesn't see any reason why Russia would interfere in the United States' presidential election, pointing to Putin's denials.

"He just said it’s not Russia,” Trump said. “I will say this, I don’t see any reason why it would be.”

Trump also said both countries were to blame for rocky relations between the U.S and Russia.

Maddow on Monday said the country was "shaken" by the joint press conference.

"This is a reason why there’s a big national freakout over what the president just did in public," Maddow said. "Whatever happened in the long private meeting [Trump] insisted on taking with Vladimir Putin today with no other American officials present, whatever happened there, what happened in public thereafter has really shaken the country today."