The hearing is expected to focus heavily on Trump’s Iran diplomacy, including efforts to extend a cease-fire, reopen the Strait of Hormuz and launch detailed nuclear talks.
Rubio, who also serves as Trump’s national security adviser, has been central to those Iran deliberations and to a tougher U.S. campaign aimed at forcing reforms in Cuba.
Congressional scrutiny is rising as lawmakers weigh limits on Trump’s Iran war powers, while Rubio returns to Capitol Hill on Wednesday for a second budget hearing before the House.