WATCH: Government shutdown showdown

WATCH: Government shutdown showdown https://s.abcnews.com/images/WNN/181226_wnn_palmeri_pic_hpMain_16x9_992.jpg

WATCH: Government shutdown showdown

Now Playing: Standoff on tap over shutdown

Now Playing: Government shutdown enters 4th day

Now Playing: Government shutdown showdown

Now Playing: Trump's demand for a border wall likely to stretch gov shutdown into the new year

Now Playing: White House warns shutdown could last into 2019

Now Playing: Trump forces defense secretary to leave post early

Now Playing: Federal employees in chaos during partial government shutdown

Now Playing: The Year 2018: Drama in politics

Now Playing: Trump foregoing his trip to Mar-a-Lago with the government in partial shutdown

Now Playing: Chris Christie: 'This wasn't one of the best weeks' for President Trump

Now Playing: Sen. Jeff Merkley: 'We're absolutely willing to fund border security,' but not a wall

Now Playing: Mick Mulvaney: President Trump 'not going to not accept money for a border wall'

Now Playing: Trump continues to face backlash over troop pullout in Syria

Now Playing: Partial government shutdown will continue through Christmas

Now Playing: The Trump presidency's top 5 pivotal moments of 2018

Now Playing: Government partially shuts down before Christmas

Now Playing: Ginsburg recovering from cancer surgery

Now Playing: Year in review: ABC News team reflects on global stories that drove 2018

Now Playing: Ruth Bader Ginsburg cancer scare

Now Playing: The British royal family in 2018

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