Republicans will soon begin sifting through "hundreds" of executive actions implemented by President Obama in order to determine which ones to reverse, House Speaker Paul Ryan said Thursday.

"That is something that the transition team is working on right now as to what executive actions that the Obama administration did and how we are going to deal with it," Ryan told reporters.

Many are wondering whether Trump will reverse the Obama administration's move to end the deportation of some illegal immigrants who arrived here as children, a group supporters label "Dreamers."

Ryan, R-Wis., said he doesn't know which executive actions are likely to be revoked, but said the Trump administration and Republicans may be looking for executive action targets to eliminate that won't cause an uproar, as deporting the Dreamers is likely to do.

On Capitol Hill, Republican Sen. Lindsey Graham, of South Carolina, has registered his opposition to any move by Trump to deport them by reversing Obama's executive action protecting the group.

"I know what they want to do is make sure we have a smooth transition," Ryan, who met Wednesday with Vice President-elect Mike Pence, said of the Trump transition team.

President-elect Donald Trump has pledged to "cancel every unconstitutional executive action, memorandum and order issued by President Obama" during his first 100 days in office.

That promise was made during the campaign. Last month, Trump released a video outlining what he'll do first when he is sworn into office on Jan. 20. It excluded any mention of the Dreamers, and instead listed his own planned executive actions, including withdrawal from the Trans-Pacific Partnership trade deal.

Trump also pledged to remove "job-killing restrictions on the production of American energy," which is an indication he is likely to reverse some of Obama's Environmental Protection Agency regulations, such as the clean water rule that has drawn strong opposition from farmers.

"There are hundreds of executive actions that are out there that we are going to be, they are going to be sifting through," Ryan said.