If Rahm Emanuel runs for mayor of Chicago, he’s not going to get the endorsement of Rep. Luis Gutierrez (D-Ill.). He might get a rival for the job instead.

The outspoken Illinois Democrat had some choice words for the White House chief of staff back in April, when he told The Hill that Emanuel should “stay in the White House.”

“He’s not going to get my endorsement anytime soon,” Gutierrez said then. “He should stay in the White House, but then he can go make millions in investment banking,” he added, referring to Emanuel’s lucrative years in finance before he ran for Congress in 2002.

Gutierrez, a fierce advocate for comprehensive immigration reform, also said at the time that he would stay in Congress rather than run for mayor himself. “I’m staying. I have an election in November,” he said in the interview. “I am not going to run for mayor. Not going to happen.”

But that was before Mayor Richard Daley announced he would not seek a seventh term. Gutierrez, who considered challenging Daley in 2007, released a statement Tuesday indicating he was considering jumping into the race. The Chicago News Cooperative reported that he would soon open an exploratory committee.

Gutierrez and Emanuel have clashed since Emanuel was a White House advisor to President Bill Clinton in the 1990s. More recently, Gutierrez has blamed the Obama chief of staff in part for what he has described as a lackluster push for an immigration overhaul, his signature issue.