Here are the GOP lawmakers breaking with Trump over his national-emergency declaration

Rep. Hurd represents the largest swath of the southern border, yet he is a vocal opponent of Trump's border wall. Hurd has called for a more technologically savvy approach to border security.

The Senate has not yet voted on the resolution, but due to the procedure required for this type of action, the upper house of Congress will take up the matter within the next several weeks. (It cannot languish in committee or never be brought to the floor by Senate Majority Leader Mitch McConnell.)

Sen. Tillis wrote in an op-ed in The Washington Post saying that "President Trump has few bigger allies than me when it comes to supporting his vision of 21st-century border security, encompassing a major investment in technology, personnel and infrastructure, including new physical barriers where they will be effective."

Despite his support of Trump's border security proposals, he said he would support a resolution to disapprove of Trump's declaration of a national emergency.

"As a U.S. senator, I cannot justify providing the executive with more ways to bypass Congress," Tillis wrote.

Last week Sen. Collins told the Associated Press, "If it’s a ‘clean’ disapproval resolution, I will support it."

On Tuesday, The Hill reported that Murkowski would support the resolution.

"When I say probably, I want to make sure that what in fact we are voting on when it comes to the Senate is what I believe it is," she told local news station KTUU last week. "If it's what I have seen right now, I will support the resolution to disapprove."