Democratic front-runner Hillary Clinton will assail the prospect of a Donald Trump-appointed U.S. Supreme Court justice on Monday, her campaign said, as she seeks to regain momentum from party rival Bernie Sanders, the winner of three weekend nominating contests.

Clinton will criticize U.S. Republican senators for refusing to consider President Barack Obama's nominee, Merrick Garland, and voice concern about any nominee from Trump, front-runner in the Republican race for the Nov. 8 presidential election, her campaign said.

A Trump nominee to fill the position vacated with the Feb. 13 death of Justice Antonin Scalia would seek to curb Americans' rights and empower corporations, Clinton will say in the speech urging Republicans to do their jobs and consider Garland.