Who is the replacement DHS Secretary?
"Mexico must apprehend all illegals and not let them make the long march up to the United States, or we will have no other choice than to Close the Border and/or institute Tariffs", Trump wrote.
Ms Nielsen's resignation was seized upon by John Delaney, one of the Democratic candidates for the 2020 presidential nomination. And during the government shutdown over Trump's push for funding for a border wall, Ms Nielsen's stock inside the White House even appeared to rise.
She was sworn in as DHS secretary in December 2017. Right now there is space for about 3,000 families, and facilities are at capacity.
"System has been broken for many years". However, nearly 250 families have been separated since - without violating the June order, the government claimed in February this year.
Oleksandr Zinchenko reassures Manchester City over 'not so serious' injury
One of those, Sergio Aguero , will be assessed on Saturday morning to determine whether he is fit enough. Now it's the business end and I just need to do what I can to help the team win games.
Homan, a Fox News contributor, called McAleenan one of the smartest men with whom he has worked.
Nielsen has often clashed with federal lawmakers and reporters who have questioned her about the Trump administration's immigration policies-particularly the forcible separation of families and the caging of children at the U.S. -Mexico border as well as her recent proposal to deport unaccompanied migrant children.
Her resignation letter lacked any sense of controversy - unlike those of others who have left. Trump threatened to fire her and she previously considered resigning, but officials at the time recognised there were no obvious successors in place.
She went into a meeting with Mr Trump yesterday not knowing whether she'd be fired or would resign, and she ended up resigning.
But Nielsen, 46, has suffered from tepid support within the administration, taking public responsibility for Trump's deeply divisive anti-immigration policies. Individuals have, under federal and worldwide law, a right to ask for asylum at recognized ports of entry to the U.S. But the source said, it is believed within the administration that Trump will be pushing for personnel changes. Some 400,000 migrants were apprehended at the border in the October 2017-October 2018 period, compared to the 1.6 million in 2000.
On Friday, US media reported that Trump also pulled his nominee to lead the Immigration and Customs Enforcement department - saying he wanted someone "tougher" at the helm of the Homeland Security sub-agency.