The only commitment Speaker John A. Boehner is making on the Export-Import Bank is this: If the Senate is able to pass a bill on the export credit agency’s future, there will be an “open amendment debate.” The Export-Import Bank is set to expire on June 30, and conservatives are expressing increased optimism its charter will lapse. More to the point, and perhaps more importantly, GOP leaders are increasingly sounding open to letting the bank die. Asked Thursday, during his weekly on-camera news conference, if he had promised Sen. Maria Cantwell a vote on Ex-Im, Boehner was emphatic that no such deal was made. “She has contacted me and I told her I would not make that commitment,” Boehner said Cantwell’s call for a vote on Ex-Im.