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On Monday, two leading Republicans in Congress sent letters to President Trump calling for a “full investigation” of Russia’s interference in the 2016 election.

In both letters, Sens.

John McCain (R-Ariz.) and Lindsey Graham (R) also wrote that “a full investigation should take place into the Russian role in our election.”

Trump has repeatedly called for the investigation to be completed before the end of this month.

“We have no choice but to investigate this as a full and thorough investigation,” McCain said in a statement.

Graham wrote that he was “convinced the Trump campaign colluded with Russia to influence our election” and called on the president to “take all necessary steps to prevent such interference.”

McCain and Graham are both senators from states that Trump won.

While McCain is the chairman of the Senate Armed Services Committee, Graham is one of the most outspoken lawmakers against the president.

In the letters, both lawmakers wrote that Trump’s response to the Russian meddling should be to “investigate and punish those responsible.”

Trump’s reaction to the investigations is also what led to a “firestorm” of criticism, with Republican lawmakers warning of a potential conflict of interest with the Russia investigations.

On Tuesday, Sen. Mike Lee (R – Utah) called for Trump to immediately issue an executive order requiring the Justice Department to open a criminal investigation into any members of the Trump administration or their staff who had ties to the Kremlin.

“It is not enough to say that these are individuals or organizations that did something wrong,” Lee wrote in a letter to Trump.

“Instead, we must be clear that they have acted with direct and direct coordination with the Russian government to meddle in our elections.”

In the letter, Lee and Sens.

Rand Paul (R — Kentucky) and John Cornyn (R – Texas) wrote that it is “time to put the focus back on the real issue: whether the Trump Administration has any role in orchestrating the Russian interference in our 2016 election.”