President Trump's comments on the Israel-Iran conflict have veered from full throated support for Israel's strikes to strongly distancing himself from them, and back again.
His ambiguity has added to the sense of uncertainty as the fighting itself escalates.
Meanwhile the Israeli prime minister Benjamin Netanyahu has said the attacks were "fully coordinated" with the US.
So what factors are weighing on Trump and, crucially, what are his options now?
As Israeli missiles hit Tehran on Thursday, Trump threatened Iran's leaders with "even more brutal" attacks from his Israeli ally armed with American bombs.
