Any senator from one of the parties could then demand a vote because the decision would be considered "privileged". Mr. McConnell told Mr Trump that he would have no choice but to schedule a floor vote on the action within 15 days, and Republican helpers have estimated that between three and ten Republicans would sit with the Chamber's Democrats against Mr. Trump.
It would force the president into a politically expensive effort to keep the Senate from considering his veto of the decision, even as Democrats moved to block him in the courts.
"He's been talking about all this for a month in front of the cameras," said Don Stewart, a spokesman for Mr. McConnell who played the exchange. The leader delivered a similar message to Vice President Mike Pence and the President's son-in-law and senior advisor, Jared Kushner, three weeks ago during the negotiations to reopen the government. Since then, both men have advised the president to move cautiously on the emergency statement, according to a senior official.
The administrative authorities made a stern note on Monday and said President needed the threat of a statement to press Mrs Pelosi.
"Congress has failed to do its work – this congress, last congress and for some time to ensure we have what we need at the southern border, which of course centerpiece is a physical barrier, wall, steel slats, "Kellyanne Conway, adviser to the president, told reporters.