While suspending receipt of a retirement benefit is still allowed under the Bipartisan Budget Act of 2015, the utility of doing so depends on specific birthdates.
If you were born on or before May 1, 1950, you can suspend receipt of your retirement benefit at or after your full retirement age (FRA) up to age 70 and still receive spousal and child's benefits off of you record during suspension, although the request to suspend must have been made by April 29, 2016.
If you were born after May 1, 1950, you can suspend receipt of your retirement benefit at or after your full retirement age (FRA) up to age 70 but no one can receive spousal or child's benefits based on your record during suspension.
GN 02409.110 Conditions for Voluntary Suspension
A. When voluntary suspension is possible
1. Requesting voluntary suspension
Any primary retirement insurance benefit (RIB) applicant or beneficiary, whether reduced or unreduced, who has reached full retirement age (FRA) may voluntarily ask that we suspend his or her benefits to earn voluntary delayed retirement credits (VOLDRC). This request may be either written or oral, and we do not need a signature. A representative payee can make the request on behalf of the beneficiary.
Note: The receipt of disability insurance benefits (DIB) prior to RIB has no effect on a beneficiary’s request to voluntarily suspend his or her RIB.
So there is no question whatsoever that you can suspend your retirement benefit at or after your FRA.