Fox News contributor Marie Harf and RNC spokesperson Kayleigh McEnany battled on "America's Newsroom" Thursday as they debated the ongoing partial government shutdown.

House Speaker Nancy Pelosi on Wednesday sent President Trump a letter informing him that she will not allow him to deliver his State of the Union address before Congress during the shutdown.

Reacting to Pelosi’s letter, Trump told reporters at the White House "we'll do something in the alternative," suggesting a speech of some kind will still happen next week.

Host Sandra Smith noted that a new Fox News poll found that 43 percent of registered voters support building President Trump's long-promised wall along the U.S.-Mexico border, up four points from September. The number who oppose the wall remained the same at 51 percent.

Sen. Graham: 'Nancy Pelosi Has Become a Nightmare for the Democratic Party'

'What About the DREAMers?': Tomi Lahren Says Dems Value Open Borders More Than DACA Fix

McEnany noted that a Harvard CAPS/Harris poll released Tuesday found that 49 percent of registered voters support some security barrier, with 51 percent opposing it.

She said poll numbers can vary wildly based on how questions are phrased and if the word "barrier" is used instead of "wall."

She argued that Pelosi is "risking a lot by playing politics" on this issue, pointing out that the same new Fox News poll found that 56 percent wanted to watch Trump's State of the Union address on Tuesday.

"I think the needle will shift and is shifting toward the president," McEnany said.

Harf countered that the Fox News poll also found that an overwhelming majority of Americans believe the government shutdown is an emergency (75 percent), and a majority blame Trump (51 percent).

She characterized the fight over the State of the Union as a "sideshow" to the larger shutdown issue.

"I'm glad it's been postponed, and I'm glad he'll be giving it after the shutdown's over. I can't wait to hear," Harf said.

Watch the discussion above.

'They Believe in Her': Lawrence Jones Asks AOC's Constituents About Her Progressive Agenda

'I'm Sad Our Country's in This Place': Juan Williams on Pelosi-Trump Feud, SOTU Postponement