Bush's Operation Jumpstart put boots on the ground along the border; Obama ordered National Guard air support to the area.
The White House announces that President Donald Trump has signed the presidential memorandum for sending National Guard troops on assignment to the southern border. He has been briefed twice in recent days by senior administration officials about the migration issue, and has "directed a vigorous administrative strategy to confront this threat and protect America's national security", according to White House press secretary Sarah Huckabee Sanders.
Mrs Nielsen added that the high levels of drug smuggling, illegal immigration and unsafe gang activity across the Mexican border were "unacceptable", despite action by the administration to combat these crimes.
Trump plans to sign a proclamation Wednesday directing the Defense Department and Homeland Security Department to work with governors to deploy National Guard units to the border, Nielsen said.
Nielsen said the Trump administration is anxious about a recent rise in apprehensions, which had dropped sharply after the 2016 presidential election.
The senators condemn the "baseless and offensive comments about Mexico and Mexicans", reject efforts to militarize the countries' shared border and ask the U.S. Congress to insist the president deal with Mexico "on the basis of respect and collaboration".
Mr. Hernandez has been the first American civilian to be killed by active duty military troops since the Kent State massacre in 1970, and the incident led the Clinton administration to suspend troop patrols near the border.
One congressional aide said that lawmakers anticipate 300 to 1,200 troops will be deployed and that the cost was expected to be at least $60 million to $120 million a year. Obama had rolled out a almost identical National Guard deployment four years earlier, sending 1,200 troops to the border at a cost of $500 million, before scaling the deployment back in the beginning of 2012.
She suggested some troops could begin arriving as soon as Wednesday night, though other administration officials cautioned that details on troop levels, locations and timing were still being worked out.
13-year-old boy rescued, hours after disappearing into sewer pipes
Thirteen-year-old Jesse Hernandez tells KNBC-TV he was exhausted and a bit scraped up but otherwise OK after his ordeal . This all while he was getting hit with raw sewage rushing at 15 miles per hour.
Arizona Gov. Doug Ducey says his state welcomes the deployment of the National Guard to the U.S. -Mexico border.
She said the administration had drafted legislation and would be asking congress to provide the legal authority and resources to address "this crisis at our borders".
"I don't want to get ahead of the governors", she said at the White House Wednesday.
The secretary cited a historic uptick in border crossings in spring months like April and advertising from smuggling groups, calling it in part "anticipating". Tuesday's briefing was a follow-up to discuss the plans.
In tweets earlier this week, Trump said a deployment was necessary until a wall was completed on the southern border.
"If it reaches our border, our laws are so weak and so pathetic.it's like we have no border", added the president - who lashed out at his predecessor Barack Obama for allegedly weakening border security, without elaborating on his claims.
The mobilization only makes sense as a very expensive way to send a message: that Donald Trump is still tough on immigration, damn it.
It's not as drastic a move as the president hinted at yesterday, when he said the border would be secured "militarily", adding "we really haven't done that before-certainly not very much before".