Securing Our Border States Act This bill requires the Department of the Treasury to provide grants to states for building barriers and related infrastructure along the U.S.-Mexico border. Within 30 days of receiving a certification from a border state that it intends to use such grant funding for constructing a border barrier, Treasury must disburse funds to the state, with the amount based on the number of miles of border in that state that currently does not have a border barrier. The bill provides $22 billion of funding for this grant program and permanently rescinds $22 billion from funds made available for various assistance programs related to COVID-19.