The United States expressed confidence that peace talks with Iran would proceed in Pakistan, and a senior Iranian official said Tehran was considering joining, but significant hurdles and uncertainty remained as the end of the ceasefire loomed. The two-week truce in the war is set to expire within days, and despite Iran's earlier ruling out a second round of negotiations this week, a Pakistani source involved in the discussions told Reuters there was momentum for talks to recommence on Wednesday. "Things are moving forward and the talks are on track for tomorrow," the source said on Tuesday on condition of anonymity, adding US President Donald Trump could attend in person, or virtually, if a deal were to be signed. Trump also said the blockade on Iranian ports will remain until Tehran agrees to a deal.