President Donald Trump announced Thursday his veto of the Congress resolution against his national emergency decreed to finance the border wall with Mexico, minutes after it was approved by the Senate, with the support of 12 Republican senators.

“VETO!” Trump wrote briefly on his Twitter account shortly after the Senate approved, two weeks after the lower house did the same, the resolution against him.

VETO! — Donald J. Trump (@realDonaldTrump) March 14, 2019

It is the first presidential veto power he has used since he arrived at the White House in January 2017.

The resolution of the Senate is especially remarkable since it counts on republican majority, the party of Trump, reason why it supposes a hard blow to its authority.

With a result of 59 in favor and 41 against, a total of 12 conservative senators opted to join the Democratic opposition against the president.

Trump’s veto returns the proposal to Congress, but now it would require the support of two thirds of the House of Representatives and the Senate to make it effective.

Although it could succeed in the House, where the Democrats have a majority; It seems difficult for the proposal to achieve the 67 votes needed in the Upper House, since eight Republicans would have to join more than those who voted today.

The resolution against the national emergency was presented in the lower house by the president of the Hispanic Caucus of Congress (CHC), Joaquín Castro, with the aim of censure that Trump has overlooked the legislative authority of the congressmen, who had not approved the funds for the wall that the president wishes.

The presidential veto is one of the most important legislative tools to prevent the approval of a law that is undesirable for the president, or to force Congress to modify the legislature before it is presented and signed by the president.