; of which $190,000,000 shall be available until September 30, 2020: Provided , That such amount is designated by the Congress as an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985: Provided further , That the amount provided under this heading shall be available only if the President designates such amount as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of such Act. procurement, construction, and improvements For an additional amount for Procurement, Construction, and Improvements for necessary expenses to respond to the significant rise in unaccompanied minors and family unit aliens at the southwest border and related activities, $85,000,000, to remain available until September 30, 2023: Provided , That such amount is designated by the Congress as an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985: Provided further , That the amount provided under this heading shall be available only if the President designates such amount as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of such Act. U.S. Immigration and Customs Enforcement operations and support For an additional amount for Operations and Support for necessary expenses to respond to the significant rise in unaccompanied minors and family unit aliens at the southwest border and related activities, and for the necessary expenses for enforcement of immigration and customs laws, detention and removal of aliens crossing the border unlawfully, and investigations, $534,566,000