President Trump knew about a six-figure payment that Michael Cohen, his personal lawyer, made to a pornographic film actress several months before he denied any knowledge of it to reporters aboard Air Force One in April, according to two people familiar with the arrangement. Mr. Giuliani said this week that the reimbursement to Mr. Cohen totaled $460,000 or $470,000, leaving it unclear what else the payments were for beyond the $130,000 that went to Ms. Clifford.