Navy Constellation (FFG-62) Class Frigate (Previously FFG[X]) Program: Background and Issues for Congress [Updated November 10, 2020] [open pdf - 3MB]
From the Introduction: "This report provides background information and discusses potential issues for Congress regarding the Navy's Constellation (FFG-62) class frigate program, previously known as the FFG(X) program. The FFG-62 class program is a program to procure a new class of 20 guided-missile frigates (FFGs). The Navy's proposed FY2021 budget requests $1,053.1 million (i.e., about $1.1 billion) for the procurement of the second FFG-62."
CRS Report for Congress, R44972
Congressional Research Service: https://crsreports.congress.gov/