to make mexico pay for it. >> will american taxpayers pay for the wall? >> ultimately it will come out of what is's happening with mexico. we're going to be starting those negotiations relatively soon and we will be in a form reimbursed by mexico which -- >> so, they'll pay us back? >> absolutely 100%. >> when does construction begin? >> as soon as we can, as soon as we can physically do it. >> couple months? >> i would say in months, yeah, i would say in months. certainly planning starting immediately. >> reporter: it's not clear where the existing money would come from to pay for the wall and congress would still need to approve any new funding to build it. trump himself has estimated kosta round $10 billion. but today's move also means beefing up manpower on the border. 5,000 additional customs and border protection officers. and in a second executive action signed today, the president is increasing deportations of undocumented immigrants, tripling resources for enforcement and withholding funding from so-called sanctuary cities. when local municipalities