Iran threatened on Saturday to block a corridor planned in the Caucasus under a regional deal sponsored by U.S. President Donald Trump, Iranian media reported, raising a new question mark over a peace plan hailed as a strategically important shift.

Language in the "peace deal" will give the U.S. exclusive rights to develop a key transit route that will be named after Trump.

(Reuters) -A peace push backed by U.S. President Donald Trump leaves Azerbaijan and Armenia just one step from a final peace deal and is a paradigm shift in the strategically important South Caucasus region,