The money includes boats on the Rio Grande, and planes to help detect "the drug cartels that are trying to smuggle people into our country," Texas Gov. Greg Abbott said.
Documents obtained by Newsweek show the number of single, adult migrants in U.S. custody has grown every week by 1,000 along the U.S.-Mexico border.
Trump was pictured with a document hinting at an agreement with Mexico.
The president waved a sheet of paper in front of reporters, claiming it was a secret agreement with Mexico. "Right here is the agreement," Trump said without any providing details.
Children reported being "forced to join gangs or be murdered," Physicians for Human Rights said.
More than 500 people, including many families, from African countries have been detained crossing the U.S.-Mexico border, since May 30, the U.S. Customs and Border Protection agency said.
"Today the numbers report was published, and indeed the flows are growing too much, so they can't be maintained as they are," Mexico Foreign Affairs Secretary Marcelo Ebrard said.
25-year-old Johana "Joa" Medina León died on Saturday after she complained of chest pains while in ICE detention and tested positive for HIV.
The savings for those who travel south of the border for treatment can be as high as 40 to 70 percent, Patients Without Borders CEO Josef Woodman said.
To handle the surge of asylum seekers arriving at the southern border, churches have opened their doors for those in need of shelter.
U.S. Border Patrol Chief Carla Provost called for greater "consequences" for migrants caught crossing into the U.S. outside of designated ports of entry.
"Shoot em'!" a crowd member suggested at a Florida rally after President Donald Trump asked how the U.S. can stop migrants arriving at the border.
U.S. Border Patrol agents are collecting biometric data from migrant children, including fingerprints, iris scans and photographs.
"Families are fleeing violence and turmoil to seek refuge at our borders, and Donald Trump wants to charge them a fee to gain asylum," Democratic presidential candidate Julian Castro said.
The military can't act "like they would normally act" at the border, President Donald Trump said.
"The Trump administration cannot simply ignore our laws in order to accomplish its goal of preventing people from seeking asylum in the United States," said the deputy director of the ACLU's Immigrants' Rights Project.
"If you're going to have a coherent, cohesive society, then everybody has to have some agreed-upon rules," the former president said.
President Donald Trump reportedly demanded that Homeland Security Secretary Kirstjen Nielsen take measures, including some of which were illegal, to stop all migrants from seeking asylum.
Senator Kamala Harris condemned President Donald Trump's statement that he "may" shut down the southern border in response to a surge in asylum seekers, including many families from Central America, arriving at U.S. ports of entry.
The Trump administration's apparent dismissal of human rights monitors "puts the United States squarely in the company of some of the worst human rights abusers around the world."
At least 186 people between the ages of 13 and 66 have reportedly contracted the virus at Texas immigration detention centers.
Of the new separations, the Trump administration said 225 were over "parent criminality, prosecution, gang affiliation or other law enforcement" purposes.
"The border 'emergency' is a manufactured crisis," Governor Gavin Newsom plans to say Tuesday, according to prepared remarks for his State of the Union address.
"New Mexico will not take part in the president's charade of border fear-mongering by misusing our diligent National Guard troops," Governor Michelle Lujan Grisham said.
The additional troops will hike the total number of forces at the border to about 4,350, according to the Department of Defense.
Former cartel members testified that narcotics were hidden in shipping containers, passenger cars with hidden compartments, trucks, tanker trains and even cans of jalapeños.