Sen. Marco Rubio has asked Treasury Secretary Jack Lew to demand the resignation of the IRS commissioner, after news surfaced that the agency had targeted Tea Party organizations. The agency has reportedly targeted other conservative groups that focus on government spending and the federal debt.

“It is clear the IRS cannot operate with even a shred of the American people’s confidence under the current leadership,” the Florida Republican said in a letter to Lew. “Therefore, I strongly urge that you and President Obama demand the IRS Commissioner’s resignation, effectively immediately. No government agency that has behaved in such a manner can possibly instill any faith and respect from the American public.”

Full text of the letter below: