Sen. Tammy Duckworth Ladda (Tammy) Tammy DuckworthMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Biden courts veterans amid fallout from Trump military controversies John Fogerty: 'Confounding' that Trump campaign played 'Fortunate Son' at rally MORE (D-Ill.) predicted Sunday that there are enough votes in the Senate to block President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's national emergency declaration.

She acknowledged, however, that whether lawmakers have enough votes to override a veto from Trump is a "different story."

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“I think we do. Now whether we have enough for an override of veto, that’s a different story," she said when asked on ABC's "This Week" if there are enough Senate votes to block the declaration.

"But frankly I think there’s enough people in the Senate who are concerned that what he’s doing is robbing from the military and the [Defense Department] to go build his wall," Duckworth continued. "That it’s really not the best way to fight the crisis that he’s talking about at the border.”

Sen. Tammy Duckworth tells @martharaddatz she believes the Senate has enough votes for a joint resolution to terminate Pres. Trump's national emergency declaration: "Now whether we have enough for an overriding veto, now that's a different story." https://t.co/nuOWVPDr7F pic.twitter.com/ph6guLKmpc — This Week (@ThisWeekABC) February 17, 2019

Congress can attempt to block Trump's emergency declaration by passing a joint resolution of termination. Such a resolution is likely to pass in the House, where Democrats have control.

The resolution would be privileged in the Senate, and could not be blocked by a filibuster.

Democrats have 47 seats in the Senate and would need to get four Republicans to vote with them for the measure to pass the chamber. In a 50-50 tie, Vice President Pence would cast the deciding vote against a resolution of disapproval.

It's unlikely the measure would get the two-thirds majority votes in the House or Senate to override a presidential veto. Trump has yet to issue a veto against legislation in his presidency, and the resolution could become the first to attract a veto.

Trump on Friday declared a national emergency at the southern border to circumvent lawmakers and spend about $8 billion on barriers along the border.

Democratic leadership in Congress quickly promised that they would oppose the declaration, including by introducing legislation to block it.