This report discusses the reviews of EPA policies regarding new rules created in 2015 regarding emission of greenhouse gases and ozone air pollution. The new regulations were put in force through authority given to the EPA in the Clean Air Acts of 1970, 1977, and 1990. Some Congressional members would like to revoke some of the authority of the EPA to change existing emission regulations and instead require Congressional approval for changes which along with the new presidential administration has prompted a review of environmental policies and EPA powers.

This report discusses instances of violence against Members of Congress and their staffs, and provides brief descriptions of a selected list of incidents and previous legislation passed to increase security after attacks. It also includes a list of current legislative proposals in response to the June 14, 2017 attack on Republican Members of Congress at a Congressional baseball game practice in Alexandria, Virginia.