Tennessee Rep. Diane Black announced a long expected run for governor on Wednesday.

The four-term member, who became the first woman to chair the Budget Committee earlier this year, will not run for re-election to the 6th District in 2018. She’s vying to become the Volunteer State’s first female governor.

“I’m Diane Black, and I don’t back down,” the congresswoman says her in announcement video. “It’s just how I’m wired.”

One of the wealthiest members of Congress, she can afford to self-fund part of her campaign.

President Donald Trump won Black’s district by nearly 50 points. Black won re-election by a similar 49-point margin last fall. She leaves behind a safe GOP seat that’s likely to attract a crowded primary field.