Sen. Lindsey Graham Lindsey Olin GrahamGraham: GOP will confirm Trump's Supreme Court nominee before the election Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee MORE (R-S.C.) on Tuesday defended Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE from President Trump's criticism, saying Trump's recent tweets are "highly inappropriate."

Graham said in a statement that Sessions is "one of the most decent people I've ever met in my political life."

"He’s a rock-solid conservative, but above else he believes in the rule of law," Graham said.

"Jeff understands that we are a nation of laws, not men. On occasion, I’ve vigorously disagreed with Jeff but I’ve never once doubted his integrity or sense of fair play."

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Trump in recent days has targeted Sessions over his recusal from the ongoing federal investigation into Russian election meddling. He told The New York Times he would have picked someone else for the job if he knew that was going to happen, and on Monday he called the former Alabama senator "beleaguered."

On Tuesday morning, Trump criticized Sessions again, saying the attorney general has taken a "VERY weak position on Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE crimes."

Graham in his statement Tuesday expressed concern over Trump calling for a probe into his former campaign rival.

“President Trump’s tweet today suggesting Attorney General Sessions pursue prosecution of a former political rival is highly inappropriate," Graham said in the statement.

"Prosecutorial decisions should be based on applying facts to the law without hint of political motivation. To do otherwise is to run away from the long-standing American tradition of separating the law from politics regardless of party.”