SPRINGFIELD, Ill. (AP) — A Democratic state senator in Illinois says he has started a federal super PAC to combat the millions of dollars that Republican Gov. Bruce Rauner and his supporters are spending on state Legislative races.

Federal Election Commission filings show the Leading Illinois for Tomorrow political action committee, started by Daniel Biss of Evanston, has spent more than $1 million this week on advertising.

The Springfield bureau of Lee Enterprises newspapers reports that Republican ads have linked Democrats to Illinois House Speaker Michael Madigan, who leads the state Democratic Party.

The first ad from Biss’ super PAC began airing Tuesday in the Chicago area, and links Rauner and state Republicans to presidential candidate Donald Trump.

Rauner hasn’t endorsed Trump, but Illinois Republican Party spokesman Aaron DeGroot said the state party backs him.