WATCH: Political moments that shaped 2018

WATCH: Political moments that shaped 2018 https://s.abcnews.com/images/Politics/181228_nwo_political_ender_hpMain_16x9_992.jpg

WATCH: Political moments that shaped 2018

Now Playing: Political moments that shaped 2018

Now Playing: Trump threatens to 'close Southern Border' if Dems don't fund border wall

Now Playing: Government shutdown continues

Now Playing: 'Deportation bus' politician charged with fraud

Now Playing: Trump gets political on first visit to combat zone

Now Playing: President Trump surprises US troops

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Now Playing: President and first lady surprise troops in Iraq for Christmas

Now Playing: Trump's surprise visit to troops in Iraq

Now Playing: SPECIAL REPORT: President Trump visits US troops in Iraq on Christmas night

Now Playing: President Trump and first lady Melania visit troops in Iraq

Now Playing: SPECIAL REPORT: President Trump visits U.S. troops in Iraq

Now Playing: Negotiations to end government shutdown at a standstill

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Now Playing: Supreme Court Justice Ginsburg discharged from hospital after cancer surgery

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Now Playing: Government shutdown showdown

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