Republican Sens. Ben Sasse of Nebraska and Jeff Flake of Arizona condemned President Donald Trump over his latest attack against Attorney General Jeff Sessions and the Department of Justice.

On Monday, Trump slammed Sessions over the crmininal charges filed by the DOJ against two GOP U.S. representatives. The president was referring to Congressmen Chris Collins of New York and Duncan Hunter of California.

In August, the DOJ charged Collins with insider trading and Hunter with falsifying campaign records. Both lawmakers were early supporters of Trump.

DOJ Charged Collins and Hunter 'Because of Evidence'

In response to the president’s criticisms against Sessions, Sasse stressed, “The United States is not some banana republic with a two-tiered system of justice — one for the majority party and one for the minority party.

In addition, Sasse reminded the president that the DOJ charged the two congressmen with crimes because of evidence. They pursued the criminal charges “not because of who the president was when the investigations began.”

Furthermore, he reminded Trump that “the job of president of the United States is to defend the Constitution and protect the impartial administration of justice."

On the other hand, Flake said Trump’s behavior in attacking Sessions was wrong. He believed the president was trying to use the DOJ to “settle political scores.”

In a tweet, Flake wrote, "This is not the conduct of a president committed to defending and upholding the Constitution, but rather a president looking to use the Department of Justice to settle political scores."

Sasse and Flake Among Trump’s Vocal Critics       

Both Republican senators have been outspoken critics of the president on different issues. In July, Sasse said Trump’s Helsinki summit with Russian President Vladimir Putin was a failure.

“We did not negotiate from a position of strength," Sasse said. "We acted from a position of weakness. As a result, one of the world's worst despots walked away today from Helsinki with a win … the United States took a loss…”

Flake also criticized Trump’s performance at the Helsinki summit. He tweeted, “I never thought I would see the day when our American president would stand on the stage with the Russian president and place blame on the United States for Russian aggression. This is shameful.”