Sen. Thom Tillis, a retiring Republican from North Carolina, called on President Trump to replace Defense Secretary Pete Hegseth on Wednesday after Army Secretary Dan Driscoll resigned this week. Driscoll’s departure followed clashes with Hegseth and came after Hegseth fired Gen. Randy George, the Army’s chief of staff, leaving the Army without its top two Senate-confirmed leaders amid the ongoing Iran conflict. Driscoll had been a prominent advocate for defense technology and had pledged to bring a "Silicon Valley" ethos to military procurement. Investors told Axios that his resignation was disappointing but unlikely to derail the sector, which has attracted $51.1 billion in U.S. funding this year, according to PitchBook.