From the Summary: "This report reviews the process and procedures that currently apply to congressional consideration of foreign arms sales proposed by the President. This includes consideration of proposals to sell major defense equipment, defense articles and services, or the retransfer to third-party states of such military items. Under Section 36(b) of the Arms Export Control Act (AECA), Congress must be formally notified '30' calendar days before the Administration can take the final steps to conclude a government-to-government foreign military sale of major defense equipment valued at $14 million or more, defense articles or services valued at $50 million or more, or design and construction services valued at $200 million or more."
CRS Report for Congress, RL31675
Congressional Research Service: https://crsreports.congress.gov/