Washington, April 22 -- US President Donald Trump said his negotiators will head to Pakistan on Monday for talks with Iran, lifting hopes of extending a ceasefire set to expire this week even as Washington and Tehran remain locked in a standoff over the Strait of Hormuz. The prospect of talks, came as ships remain unable to transit the critical waterway amid threats from Iran and a US blockade on ships heading to and from Iranian ports. Iranian officials said earlier on Sunday that they remained open to negotiation, but held firm that ships wouldn't pass the strait while the US blockade remained in effect. "It is impossible for others to pass through the Strait of Hormuz while we cannot," Iranian parliamentary Speaker Mohammed Bagher Qaliba...