White House Principal Deputy Press Secretary Hogan Gidley said President Trump's first veto since taking office is a sad yet important moment.

Trump is set Friday afternoon to veto a resolution that blocks his declaration of a national emergency at the border.

On "Outnumbered Overtime" Friday, Gidley said Democrats are forcing Trump to take executive action to secure funding for his long-promised border wall.

"[There's] a lack of understanding and belief on the part of Democrats in Congress to recognize the serious, severe crisis we face along our southern border and to recognize the emergency that exists in this country," Gidley said.

He said the Senate vote to block Trump's border emergency -- in which 12 Republican lawmakers sided with their Democratic colleagues -- was a vote against the safety and security of the American people.

"That vote against this measure effectively made this country less safe. It put ... the American people's lives at risk. It is dangerous," Gidley said.

He said the lawmakers who voted against the border emergency -- both Democrats and Republicans -- will have to answer to their constituents.

"It's a sad situation," Gidley said.

Watch the "Outnumbered Overtime" interview above.

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