A public feud between President Donald Trump and his on-again, off-again ally, billionaire Elon Musk, reignited this week after an apparent truce lasted less than a month.

Trump, making his first comments on Musk’s criticism of his bill during an Oval Office press conference, insinuated the Tesla CEO opposes his “One Big Beautiful Bill Act” because he is “upset” the electric vehicle tax credit was removed, adding he’s not sure he’ll remain friends with Musk and alleging Musk “knew the inner workings of the bill.”

Their escalating feud threatens critical parts of the billionaire’s business empire — and leaves Republican legislators caught in a tussle between the two.