In testimony before Congress this week, Michael Cohen cast himself as a central figure in schemes that could threaten the presidency of Donald Trump. The revelations are set to intensify the scrutiny on Weisselberg, Trump’s unassuming 71-year-old chief financial officer, who already is a focus for federal prosecutors in New York. On Wednesday, Cohen specifically identified Weisselberg as helping mastermind a strategy to mask reimbursements to Cohen for his payment to Stormy Daniels, the pornographic film actress who said she had an affair with Trump.