The vice-president, Mike Pence, got a first-hand view of migrant detention facilities after touring two centres in Texas as he spoke out against grandstanding on Capitol Hill after legislators delivered emotional testimony about appalling conditions. Pence was in the border city of McAllen, Texas where he was joined by a delegation of Republican lawmakers as they toured migrant detention centres. President Donald Trump has said that a nationwide wave of arrests of immigrants facing deportation will begin over the weekend.