Donations sent to the National Republican Senatorial Committee (NRSC) between March 16 and October 5, 2016 on a certain platform, have been compromised. The attackers used a malware that was specifically designed to steal credit card data and personal information. Hackers accessed data related to 3,500 transactions per month, including the donors first name, last name, email address, billing details (address, city, state, and zip code), employer details, card type, card number, card expiration, and security code.”]
Source: https://securityaffairs.co/wordpress/52391/breaking-news/nrsc-hack.html