Senate Republicans have blocked a Democrat-led effort to curb President Donald Trump's powers to wage war against Iran, as the nearly three-week-old conflict escalates and rattles global energy markets.

Democrats are threatening daily war powers votes after GOP leaders blocked hearings with $1 billion a day spent and no congressional debate.

Senate Republicans have blocked a Democrat-led effort to curb President Donald Trump's powers to wage war against Iran, as the nearly three-week-old conflict escalates and rattles…