おっ

$ :| openssl s_client -connect www.whitehouse.gov:443 > /dev/null
depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = R3
verify return:1
depth=0 CN = whitehouse.gov
verify return:1
DONE