A group of House Republicans has gathered secretly for weeks in the Capitol in an effort to build a case that senior leaders of the Justice Department and FBI improperly — and perhaps criminally — mishandled the contents of a dossier that describes alleged ties between President Donald Trump and Russia, according to four people familiar with their plans.

A subset of the Republican members of the House intelligence committee, led by Chairman Devin Nunes of California, has been quietly working parallel to the committee's high-profile inquiry into Russian meddling in the 2016 presidential election. They haven't informed Democrats about their plans, but they have consulted with the House's general counsel.

The people familiar with Nunes' plans said the goal is to highlight what some committee Republicans see as corruption and conspiracy in the upper ranks of federal law enforcement.