POTUSes greet, meet, eat at White House

KOGLZV NIHHVCFDOHXO ODIHZI GOHVXLH NFOCIM SLVP OV NUXLU, TZUUIHP, XHTLGXHB (N)UIVXMIHPV BOPSIUIM KLU FZHTS.

Purple reign

Here's a "SWORN EPIC." (Those are the only nine letters to appear in both the plaintext and the ciphertext.)

RCRP ENCRIPO SWW ENCRIPOO: ENCRIPOO SCRIPO. WRP EWE CIWR SWWO ENCRIPOO: ENCRIPOO OSWWRO. (ENCRIP SCRO RCIP INWSR CR ENWIPOO.)