Sen. Jon Tester (D-MT) became the second Democratic senator to publically call on President Joe Biden to drop his bid for reelection on Thursday.

“Montanans have put their trust in me to do what is right, and it is a responsibility I take seriously. I have worked with President Biden when it has made Montana stronger, and I’ve never been afraid to stand up to him when he is wrong,” Tester said in a statement. “And while I appreciate his commitment to public service and our country, I believe President Biden should not seek re-election to another term.”

Tester is one of several battle-ground state Democrats up for reelection in the Senate. Vulnerable to a Republican challenger this November, Tester’s announcement comes after he called for Biden to prove to voters he was fit to lead the party earlier this month.

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He joins Sen. Peter Welch (D-VT) as the only two Democrats in the Senate to request their party’s presumptive nominee step aside.

This is a breaking news story and will be updated.