The Trump administration is planning to offset the steep cost of a Mexico border wall by instructing the Department of Homeland Security to cut spending on surveillance technology and freeze the pay of federal officers in the 2019 fiscal year, according to a report released Wednesday by the Democratic staff of the Senate Homeland Security and Governmental Affairs Committee.The report, which the staffers said was based on information provided to them by “a whistleblower” in late November, said the White House Office of Management and Budget (OMB) told DHS to boost its projected spending on border wall construction for the 2019 fiscal year to $1.6 billion, an amount that would be “$700 million more than the Department’s original budget request.”The $1.6 billion would be used to build additional physical barriers in the Rio Grande Valley of south Texas, the border’s busiest sector for illegal immigration.