President Trump says he is willing to declare a national emergency unless Democrats go along with his demands for $5.7 billion for a border wall.
Trump's campaign for a border wall takes him to McAllen, Texas, Thursday where he is visiting a Border Patrol station and holding a round table discussion with local officials, before heading to the Rio Grande.
As he left the White House Thursday morning, Trump said he has the "absolute right" to declare a national emergency in order to construct a border wall, but said he preferred to continue efforts make a deal with Congress. However, he said "If we don't make a deal, I think it would be very surprising to me" to not declare an emergency.
Such a declaration would almost certainly be fought in court.
Trump again claimed Republicans are unified in support behind him, saying he hasn't "ever seen unity like this in the Republican Party."
However, several Republican senators have expressed concern over the effects of the continued partial government shutdown, now in its 20th day, and a handful of Republicans voted with Democrats in efforts to re-open the government in the House.
Trump also disputed characterizations of yesterday's meeting with Democratic leaders, in which Trump abruptly walked out, this morning telling reporters that "I didn't pound the table. I didn't raise my voice, that is a lie," adding, "I don't have temper tantrums, I really don't."
Democratic congressional leaders have refused to go along with Trump's demand for border wall funding, and Senate Majority Leader Mitch McConnell has refused to take up Democratic measures to fund government agencies that have run out of appropriations.
Some 800,000 federal workers have been furloughed or are working without pay checks because of the stand off. Many will be missing their first paychecks on Friday.
Trump also said, despite his repeated campaign promises to build a wall and have Mexico pay for it, he didn't mean that literally.
"When I said Mexico would pay for a wall in front of thousands and thousands of people," Trump said, "obviously I never meant Mexico would write a check."