"We're saving tremendous amounts of money when we get this done", Trump said, "and all that savings will go into tax reform". He could take the hit without fundamentally harming his chances of winning and eventually the issue would fade away. If anything, it's getting more important, even undermining Republican unity and threatening the party's chances of passing tax reform.
It is precisely those conflicts of interest that those who want Trump to release his tax returns seek to shed light on. In late February, Trump said the tax plan was "very well finalized", only a day after press secretary Sean Spicer said it would be released "in the next couple weeks". When the topic came up during the town hall in Denair, Denham replied by saying he's "not going to ask the previous president that I served under to show his birth certificate any more than I would ask this president to show his taxes".
However, he says healthcare reform could potentially save hundreds of millions of dollars, which would then help tax reform. It is far from clear whether Congress will be able to agree on a package of comprehensive tax reforms, but if it does, the changes to the tax law may be substantial and lasting. The ads also thank Republicans for fighting House Minority Leader Nancy Pelosi.
President Donald Trump's promise to enact a sweeping overhaul of the tax code is in serious jeopardy almost 100 days into his tenure, and his refusal to release his own tax returns is emerging as a central hurdle to another faltering campaign promise. It might not be enough all on its own to kill a tax cut, but the more controversial the bill becomes, the higher the cost of supporting it becomes. If Democrats controlled the House, their representatives would chair all the chamber's committees, and multiple committee chairs would very quickly find reason to demand Trump's returns.