They’ve had Trump in a box since turncoat Sessions recused. They’re just waiting for Trump to make a move, so they can scream Watergate.
They are going to impeach anyway. This is dramatically showing that Trump is not in charge of the whole government and every day, the coup plotters are spending more and more to find or assemble whatever case they want and persecute those who work for the President. Trump has to pick his poison. All courses are bad, but IMO, if he does nothing, they will cripple his Administration and make sure that the Uniparty is never challenged again. A raid that seized all of Mueller's and his team's records would, at least, give Trump a chance to expose the treasonous conspiracy.