While Congress is unlikely to muster the votes to override the veto, the rebuke from some members of his own party left Trump politically wounded, at least temporarily, as immigration and his planned wall along the USA southern border become a flashpoint again in the 2020 presidential campaign.
A dozen defecting Republicans joined Senate Democrats in approving the joint resolution on Thursday, which capped a week of confrontation with the White House as both parties in Congress strained to exert their power in new ways.
Trump thanked Republican senators who voted for his declaration in a Twitter post earlier on Friday. Trump has attempted to coax Republicans into voting his way on the issue and painted those who vote against him as standing with House Speaker Nancy Pelosi and for crime and open borders.
Congressional critics do not appear to have the votes to override Trump's veto. "This will help stop Crime, Human Trafficking, and Drugs entering our Country", the president tweeted.
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The other Republicans who voted to oppose the declaration were Sens. It still faces several legal challenges in federal court.
This is the first veto of Mr Trump's presidency. The resolution had previously passed the Democrat-controlled House.
On 15 February Trump invoked the National Emergencies Act of 1976, claiming there was a crisis on the border that required the construction of walls to protect the United States.
In addition to Collins, the other GOP senators voting for the resolution were Lamar Alexander of Tennessee, Roy Blunt of Missouri, Mike Lee of Utah, Jerry Moran of Kansas, Lisa Murkowski of Alaska, Rand Paul of Kentucky, Mitt Romney of Utah, Marco Rubio of Florida, Patrick Toomey of Pennsylvania, Rob Portman of OH and Roger Wicker of Mississippi.
He called the resolution "dangerous" and "reckless", defending the emergency declaration and saying, "People hate the word invasion, but that's what it is".