He has already said Trump is not going to get things past himself. He says great to get rid of obamacare but balks at anything more. And, of course, he wants to “replace” obamacare. He wants to put his nominal Republican stamp on it and maybe we can have Ryancare to continue the project of thinning out the middle class.
Trump knows there is a separation of powers and respects it.
But Ryan knows that it will be Trump setting the agenda and if he balks too much he will not be Speaker for long.