A second Republican senator spoke out in defense of Nato on Thursday, joining Mitch McConnell and the Democrats, after Donald Trump said that he was “absolutely” considering withdrawing from the alliance after it refused to take part in the joint assault with Israel against Iran. “Nato stood by America when we were under attack and came to our aid after the September 11th attacks. Their soldiers fought and died alongside our troops in Afghanistan,” said Thom Tillis, a Republican, and Jeanne Shaheen, a Democrat, who co-chair the Senate Nato observer group. “Any president that contemplates attempting to withdraw from Nato...