President Trump spent at least 30 minutes on the phone Tuesday with Wayne LaPierre, the chief executive of the National Rifle Association, the latest conversation in an aggressive campaign by gun rights advocates to influence the White House in the weeks since the back-to-back mass shootings in Texas and Ohio.

The call ended the way that Mr. LaPierre had hoped it would: with Mr. Trump espousing N.R.A. talking points in the Oval Office and warning of the radical steps he said Democrats wanted to take in violation of the Second Amendment…

Mr. Trump — who did most of the talking on the call with Mr. LaPierre, according to those briefed on the conversation — made it clear that he believes there are ways to scrutinize people’s fitness for gun ownership other than the current proposals. But his latest comments on guns were the strongest sign to date that he is unlikely to make bipartisan gun legislation a priority this fall, when Congress returns from its summer recess. Without his backing, congressional Republicans said, any chance of a bipartisan bill passing the Senate is likely to be dead on arrival.