The leading Democrat on the House Financial Services Committee, Rep. Maxine Waters, will block efforts to hold a joint hearing between her committee and the House Agriculture Committee on Monday’s newly unveiled market structure discussion draft bill.

Under House rules, all participants in a joint hearing need to agree to proceed. Waters will object to the joint hearing and prevent it from proceeding as planned, a Democratic staffer told CoinDesk, pointing to U.S. President Donald Trump’s recent and increasing engagement with crypto.

The Financial Services and Agriculture Committees announced they would host a joint hearing on market structure issues last week, and unveiled the first text addressing the issue — including how the…