POTUS cancels todays golf trip last minute

POTUS gets into his SUV at WH then gets out and heads back into WH a few minutes later. USSS calls 'Lid' meaning that POTUS will not leave the WH for the rest of the day?

????

Sauce: https://www.thegatewaypundit.com/2018/09/president-trump-abruptly-cancels-labor-day-road-trip-will-remain-at-white-house-all-day/