The congresswoman President Trump called “low IQ” may end up in charge of banking regulation if Democrats win control of the House in this year’s midterm elections — and Tuesday’s special election may be a good bellwether for whether that happens.

Rep. Maxine Waters, a Democrat from California, is in line to chair the House Financial Services Committee if the Democrats take control of the House. Democrats need a net gain of 24 seats to take back control of the House, a target analysts KBW say is achievable.

At a Saturday rally for Rick Saccone, a candidate in a special election in southwestern Pennsylvania on Tuesday to fill a vacant House seat, President Donald Trump called Waters “low IQ” due to her calling for his impeachment without having a specific rationale. It’s not the first time the president has attacked Waters. At the annual Gridiron Club dinner in Washington earlier this month, Trump said Waters should take an IQ test.

In an appearance on MSNBC Waters called the Gridiron dinner comments racist. Waters responded to the latest insult on MSNBC again, telling Joy Reid “This is what this con man does. He diverts attention from himself by attacking others.”

Analysts at KBW says the special election in southwestern Pennsylvania on Tuesday to replace former Rep. Tim Murphy who recently resigned his seat, should have been a comfortable Republican win — President Trump carried the district by 18 points and Murphy ran unopposed in 2016 and 2014 and won the seat in by 28 points in 2012, when he last faced opposition. Instead a Democratic win could be a harbinger of a Democratic turnaround.

KBW says the Democratic candidate, Conor Lamb, seems to be “within striking distance of winning this race.”

Read:Why a special House election in a district Trump easily won is seen as a referendum

Waters would have a tough time implementing an agenda that would be potentially be negative for bank stocks, according to KBW, since the Senate is likely to remain Republican control.

However, as committee chair Waters would have near-unlimited authority to call Wall Street executives to Washington to testify on a regular basis, whether to answer for consumer fraud, excessive executive compensation, cybersecurity or housing issues. She first joined the committee in 1991 and is the senior-most person serving on the Financial Services Committee, having served as chair or ranking member on every subcommittee since.

In response to the financial crisis she focused on the foreclosure crisis as a long-time advocate for fair housing. Her tenure as chairman could perhaps see increased efforts to insure the future of Fannie Mae FNMA, -1.96% and Freddie Mac FMCC, -1.29% .

Debate in the Senate regarding the Crapo banking regulation reform bill will continue this week. It’s expected to pass with few additional changes to the bill, however, House Financial Services Committee Chairman Jeb Hensarling, the Texas Republican, said he wants to make additional changes to the bill before it goes to the House for a vote.

Read:Bank deregulation bill designed for smaller lenders may boost Citi, J.P. Morgan, CBO says

See also:Volcker, Angelides in opposition on regulatory rollback