When Nieto indicated his government has no interest in helping Trump fulfill his campaign promise by paying for a wall, Trump said he understood but couldn't say so publicly, and urged Nieto to do the same.
"He'll continue to fight for that funding and ensure that it takes place", she said. Sanders dodged the question, and instead touted the need for border security measures, regardless of who pays for them.
Press Secretary Sarah Huckabee Sanders tells reporters traveling aboard Air Force Once that Trump "has made no secret" that getting the wall built is a priority.
On Thursday, Sanders didn't reiterate the threat herself.
"The president is committed to making this happen and we're going to push forward".
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In a later question about his promise to get Mexico to pay for the wall, she added that efforts to have our southern neighbor fund the border wall have not been "abandoned".
"The President ran on building the wall, won on building the wall and remains steadfastly committed to doing it".
Mexico has repeatedly said it will not pay for the wall, and Trump has recently threatened to shut down the government if Congress does not provide adequate funding for the proposal. "He has not demonstrated that he understands what has made this nation great and what it is today, and he's got to demonstrate the characteristics of a president who understands that".
The Republican-controlled Congress has yet to pass a spending resolution to keep the government fully operational past September 30.
The House in late July passed a spending bill that included $1.6 billion to build the wall, which has an estimated price tag of $12 billion.