That's because you can't be trusted, Ms. Pelosi.
I'm proud of Trump. He has finally learned that Democrats and NeverTrumps cannot be trusted, with anything. Had he realized this when he first took office, as many of us did, he could have saved himself and the country a lot of problems.
Those people will shit on America in a heartbeat to damage his Presidency. No ethics. No morals. No concern for 'the troops' or for human life in general. No laws or rules apply. The only thing Democrats care about is their own personal positions and power. Trump is a threat to that. So they will do absolutely anything to destroy him.
If warning ISIS of an attack will thwart a Trump administration success, they would do it without a second thought.