a. The house is afraid of being called racists if they even consider articles of impeachment.
b. Senate needs 2/3rd majority to remove a President from office.
The house needs to focus on controlling the executive with the tools the Constitution gave it: budgeting.
The senate needs to exercise due judgment on his appointees.
Example: How will the budgeting stop amnesty for the millions that will cross the border upon hearing they get a home free card?