Colorado’s Sen. Michael Bennet has joined a growing list of Democrats who refuse to vote to confirm Alabama Sen. Jeff Sessions, President Donald Trump’s pick for attorney general.

“The U.S. Attorney General must ensure equal justice under the law, regardless of race, religion, gender, or sexual orientation,” Bennet said in a statement released Friday. “Jeff Sessions has repeatedly opposed efforts to protect the rights and liberties of all Americans. I cannot support his nomination.”

Among Bennet’s issues with Sessions, according to the statement: He has blocked bipartisan efforts to protect women and in 2013 was an outspoken critic of “principled and compassionate comprehensive immigration reform legislation” crafted by representatives from both sides of the aisle.

“This week’s executive orders on immigration make clear that Senator Sessions’ views will shape the Trump administration’s policies,” Bennet said in the statement. “We need a chief law enforcement officer who protects the civil rights of every American, not one who perpetuates fear and undermines our obligation to ensure equal justice under the law.”

Several Democrats on the Senate Judiciary Committee have already said they will vote against Sessions on Tuesday. Most have said they are skeptical that the Republican will be fair and committed to civil rights, a chief priority of the Justice Department during the Obama administration.

Sessions was first elected to the Senate in 1996 and before that served as Alabama attorney general and a U.S. attorney. In two days of confirmation hearings, he laid out a sharply conservative vision for the Justice Department, pledging to crack down on illegal immigration, gun violence and terrorism.

He was the first senator to support Trump in the presidential campaign and has been one of his most enthusiastic backers.

The Associated Press contributed to this report.