(Hill) Speaker Nancy Pelosi (D-Calif.) is facing the biggest challenge of her new leadership reign, as a growing number of Democratic lawmakers, outraged over White House stonewalling of their investigative efforts, say the House should launch impeachment proceedings against President Trump.

Pelosi has long regarded impeachment as a potential political trap, one that could alienate swing voters and threaten the Democrats’ chances of keeping the House — and seizing the White House — at the polls next year.

But last month’s release of special counsel Robert Mueller’s report on Russia’s election interference loosened Pelosi’s grip over her diverse caucus on the divisive issue, as a small pack of rank-and-file members broke away to endorse the start of impeachment proceedings.

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