Other Republicans voting with Democrats included Sens. Roy Blunt of Missouri, Susan Collins of Maine, Jerry Moran of Kansas, Lisa Murkowski of Alaska, Rand Paul of Kentucky, Rob Portman of Ohio, Marco Rubio of Florida, Pat Toomey of Pennsylvania and Roger Wicker of Mississippi.
Sen. Thom Tillis, a Republican running for re-election in North Carolina next year, said last month he would support the measure, but he flipped Thursday under intense lobbying from the White House.
He said he changed his mind because he and other lawmakers were working on a broader measure to limit the president's authority under the National Emergencies Act.
Many of the Republican defectors were careful to stress that they agreed with boosting border security funding -- a prominent theme of Trump's 2016 campaign and potentially a factor in the 2020 race.
"I believe the crisis on our southern border is real," Alexander said on the Senate floor. "U.S. Customs and Border Patrol arrested more than 66,000 illegal aliens in February 2019, the highest total in a single month since March 2009."
Most Republicans sided with the president.
"We have failed to protect our border as any sovereign nation must and our people are dying because of it," said Sen. Tom Cotton, R-Ark. "The administration's sensible, long-overdue efforts to secure the border have been met only by howls of outrage from the Democratic Party."
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