Several high-ranking House Democrats have come together to write a letter asking the FBI to investigate a possible link between Donald Trump’s campaign and the recent cyberattacks on the Democratic Party.

Ranking members of the House Committee on Oversight and Government Reform, Reps. Elijah Cummings, John Conyers, Eliot Engel, and Bennie Thompson, sent a letter to FBI Director James Comey, on Tuesday. In the letter, the House Democrats specifically asked Comey’s department to look into the hacks of the Democratic National Committee and the Democratic Congressional Campaign Committee.

The congressmen began the letter by explaining that they were “writing to request that the FBI assess whether connections between Trump campaign officials and Russian interests may have contributed to these attacks in order to interfere with the U.S. presidential election.”

They also explained their reasons for writing the letter, saying that “overt and covert actions by Trump campaign officials on behalf of Russian interests” have raised “serious questions.”

The letter includes several examples of such “overt and covert actions” by Donald Trump and his campaign. Among these examples are Trump’s repeated praise of Vladimir Putin, Trump’s policy proposals that would “greatly benefit Russia,” and, of course, his encouragement of Russian hackers to find Hillary Clinton’s deleted emails. House Democrats also brought up the questionable relationships that Trump’s foreign policy adviser, Carter Page, and his former campaign manager, Paul Manafort, both have with Russia.

The congressmen included in their letter comments from top Republicans who are concerned about Trump’s connections to Russia, quoting House Speaker Paul Ryan, former State Department counselor Eliot Cohen, and Republican Rep. Adam Kinzinger. All these men have said that Russia, and other foreign governments, should not be involved in any U.S. election.

The quote from Ryan, who reluctantly placed his support behind Trump a few months ago, is perhaps the most bluntly worded: “Russia is a global menace led by a devious thug. Putin should stay out of this election.”

The letter ended with a confession that none of the congressmen know for certain whether there is a link between Trump’s connections with Russia and the attacks that have occurred against the Democratic Party. They added, though, that despite their lack of certainty, “there is widespread agreement that the United States should take all possible steps to prevent Russia from interfering in our electoral process and prosecute to the full extent of the law anyone involved in such a scheme.”

The House Democrats are not the only members of Congress who are asking for FBI investigations. CBS reports that Senate Minority Leader Harry Reid has also asked the FBI to investigate the possibility that Russia is trying to manipulate the 2016 election. Reid wrote in his letter to the FBI that the potential threat from Russia “is more extensive than is widely known and may include the intent to falsify official election results.”

The Trump campaign has refused to comment on the latest request for an FBI investigation, and Russia has denied having any connection with the Democratic National Committee and Democratic Congressional Campaign Committee hacks.

Featured image via Gage Skidmore/Flickr, available under a Creative Commons license.