I wonder if he is going to publicly say that soon. Just look in the camera and simply say it.
"I have to admit I made an assumption that has proved to be terribly wrong. I assumed that when the people gave the Republicans the Senate, the House and the Presidency that the Republicans would keep their promises and repeal Obamacare and enact much needed tax reforms. Leading House and Senate Republicans have only proved that they are contemptuous towards the people who put them into office, and they would rather govern like Democrats."
One of the best things Trump can do at this point is to strategically run against Congress and point out their inaction.
Frame it as working against the interests of the American people rather than making it a personal fight.
Don’t overplay it however because he will need them especially with the burgeoning NORK crisis.