It's dereliction of duty by Congress if not outright aiding and abetting

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"Long before Special Counsel Robert Mueller’s report dropped, it became crystal clear that the sitting president of the United States has committed serious crimes. We need leaders in Congress who are ready and willing to rise to the occasion by checking and balancing the executive branch. Failing to impeach will only embolden our kleptocrat-in-chief.

Many supporters of impeachment proceedings have suggested that the House begin the process immediately. The potential grounds for impeachment seem endless: the president has obstructed justice, colluded with a foreign power, violated the emoluments clause by enriching himself through office, and made a litany of documented lies to the public, the press and policymakers themselves.

But Democratic Party leaders, including House Speaker Nancy Pelosi, have insisted that impeachment proceedings are not a priority. While impeachment is still technically on the table, Pelosi claims that Trump “just isn’t worth it.”"