Now Playing: All GOP senators want to halt separation of families at border, McConnell says

Now Playing: President Trump digs in on false claim that crime on rise in Germany

Now Playing: Trump launches into free-wheeling defense of 'zero tolerance policy'

Now Playing: Lawmakers turned away from migrant detention center

Now Playing: DHS Secretary Kirstjen Nielsen says separating kids at border isn't abuse

Now Playing: Rev. Al Sharpton decries separation of immigrant families

Now Playing: Senators refute Trump's stance that only Congress can end child separation at border

Now Playing: Congressman blasts immigration policy, makes emotional plea to GOP

Now Playing: Trump to meet with Republican lawmakers on immigration

Now Playing: Justice Department IG investigating Comey memos after FBI referral

Now Playing: President Trump doubles down on immigration amid backlash

Now Playing: Nielsen defends family separation as enforcing the law: 'We will not apologize'

Now Playing: Trump directs creation of 'space force' as sixth branch of military

Now Playing: Trump: 'The US will not be a migrant camp'

Now Playing: Trump blames Democrats for border policy separating children from parents

Now Playing: Supreme Court puts off weighing in on partisan gerrymandering

Now Playing: Trump confidant reveals new meeting with Russian

Now Playing: Laura Bush calls Trump immigration policy 'cruel'

Now Playing: Weekend Rewind: Federal judge reverses Manafort's bail

Now Playing: Trump associate had undisclosed meeting with Russian in May 2016: Report