security secretary mcconneknee nielsen is heading to capitol hill. she s expected to face questions from democrats regarding president trump s national emergency declaration and immigration strategy, including family separations. it comes as new government figures reveal that despite the trump administration s policies, migrant border crossings have hit record highs. last month more than 76,000 undocumented immigrants crossed the southern border either at legal port of entry or apprehended between ports of entry. that s the highest total for february in 12 years. and the highest single month total since trump was elected. however, it is not an overall record as border crossings were consistently over 100,000 before 2008 and were higher than