Read: the struggles of Trump to get anything done.

"The 5 biggest disagreements Republicans have on Obamacare," by Andrew Prokop.  Vox.

It’s become evident that there is little GOP unity on how much a replacement plan should cost, how to pay for it, whether the Medicaid expansion should be rolled back, or how to fix the individual markets.
Furthermore, there is no evident agreement even on extremely broad questions such as, “What should the goals of the GOP’s replacement plan be?”
Accordingly, many Republicans in both the House and Senate are increasingly fearful about moving to roll back Obamacare too quickly when so little is settled about what comes after it. And their problems are compounded by the fact that while a reasonably comprehensive repeal bill could be rammed through with just 50 Senate votes plus Vice President Mike Pence, a serious replacement bill would need 60 Senate votes, at least eight of which would have to come from Democrats.

"G.O.P.’s Grand Visions for Congress Now Look Like a Mirage," by Jennifer Steinhauer.  New York Times.

The large infrastructure bill that both Democrats and Mr. Trump were eager to pursue has barely been mentioned, other than a very general hearing to discuss well-documented needs for infrastructure improvements. Even a simple emergency spending bill that the Trump administration promised weeks ago — which was expected to include a proposal for his wall on the Mexican border — has not materialized, leaving appropriators idle and checking Twitter.
At this point in Barack Obama’s presidency, when Democrats controlled Washington, Congress had passed a stimulus bill totaling nearly $1 trillion to address the financial crisis, approved a measure preventing pay discrimination, expanded a children’s health insurance program, and begun laying the groundwork for major health care and financial regulation bills. President George W. Bush came into office with a congressional blueprint for his signature education act, No Child Left Behind.
But in the 115th Congress, the Senate has done little more than struggle to confirm Mr. Trump’s nominees, and Republicans ultimately helped force his choice for labor secretary, Andrew F. Puzder, to withdraw from consideration on Wednesday in the face of unified Democratic opposition.

"Remember How Trump Was Going to Erase Obama’s Legacy Overnight? Yeah, Not So Much," by Jonathan Chait.  New York.

 Republicans in Congress have made no more progress in developing a partywide alternative in the three and a half months since the election than they made in the seven years before that. Their only options are to keep the current system, or some version thereof, or inflict cruelty upon millions and massive disruption to an industry that accounts for a fifth of the economy. “I would say it’s not that easy to repeal it,” concedes Representative Peter King. “The entire repeal is in mortal danger,” admits Representative Trent Franks.
Republican messaging heavily emphasized the notion that Obama governed largely through the issuing of executive orders, which supposedly left his agenda vulnerable to a quick reversal. Trump has illustrated how fallacious that notion was. The new president has issued a flurry of executive orders, but — with the exception of the immigration order, which was a fiasco — these orders have mostly been symbolic vehicles for communicating goals, rather than actual policy changes.

"The Formidable Checks and Balances Imposing on President Trump," by Ronald Brownstein.  The Atlantic.

But in fact Trump is facing effective questioning from virtually every counterforce, at home and abroad, that can constrain a president. A partial list would include federal courts, the career federal civil service, the “deep state” of the intelligence and law-enforcement communities, spirited investigative-reporting teams, a highly energized public opposition, state and local governments, and other nations. With Republicans determined to bolster Trump, Congress has been conspicuously absent from this list, though the squall of GOP senators demanding broader investigation of the administration’s Russia dealings following the resignation of National Security Adviser Michael Flynn may signal a change.