A day after the U.S. military bombed three Iranian nuclear sites, President Trump said he might desire a broader 'regime change' in Iran.

"The NPT, a cornerstone of the non-proliferation regime, has been manipulated into a political weapon," Iran's U.N. envoy said.

By Maayan Lubell, Phil Stewart and Steve HollandJERUSALEM/WASHINGTON (Reuters) -U.S. President Donald Trump said he had "obliterated" Iran's main nuclear sites in strikes overnight, in a major new escalation of conflict in the Middle East as Tehran vowed to reserve all options to defend itself.

Several close U.S. allies have urged a return to the negotiating table in the wake of American strikes on Iran while noting the threat posed by Iran's nuclear program

Tehran has to choose between limited reprisals, or a broader response that could provoke further American attacks.