According to The Hill, Ryan called Wednesday's meeting at the request of Democrats after Trump canceled DACA, which shields some 690,000 young illegal immigrants who were brought to the United States as children.
Ryan is part of the "Big Six" group of Republican leaders that also include Treasury Secretary Steven Mnuchin, the President's chief economic adviser Gary Cohn, Senate Majority Leader Mitch McConnell, House Ways and Means Committee Chairman Kevin Brady, and Sen.
Gleckman said policymakers could pay for tax cuts by finding new sources of revenue to compensate for lower rates, rather than expanding the deficit.
"There is no agreement", Ryan told reporters when asked about the Republican president's discussions on Wednesday night with Senate Democratic Leader Chuck Schumer and top House Democrat Nancy Pelosi on the Deferred Action for Childhood Arrivals program. "So it's really important that we fix the massive errors we have in our tax system", he said.
Rep. Raul Labrador, R-Idaho, a member of the conservative Freedom Caucus, said conservatives would demand increased interior enforcement and border security to get any deal through. And Congress must act by December 8 to fund the government or face a shutdown, which could distract from the tax debate.
"In a revenue-neutral bill, Congress can't get the rate below 26 percent even if it eliminates almost every corporate tax expenditure", Gleckman said in a blog posting accompanying the study.
The President is cutting deals with Democrats because he learned during the debt ceiling deal that Republicans complain, but they will mostly go along with whatever he agrees to.
Ryan said that Republicans hope tax reform could lead to 3% economic growth.
The White House and GOP leaders plan to reveal new details of their goal of cutting corporate and individual taxes the week of September 25, and they are imploring lawmakers to reach a budget agreement that could smooth its passage.
White House legislative director Marc Short said Tuesday that, while the president remained committed to the wall, funding for it did not necessarily need to be linked directly to the "Dreamers" issue.
House Speaker Paul Ryan declined to commit Wednesday to making tax code changes "revenue neutral", joining other Republicans in leaving the door open to raising the deficit as part of the reform effort.
"You can't just do what Bush did in 2001 and 2003", he said.