(CNN) Rick Gates' fate has long been tied to the fortunes of Paul Manafort.

Gates and Manafort, longtime business associates who served together on the Trump campaign, were the first two officials indicted Monday in connection with Justice Department special counsel Robert Mueller's investigation, on 12 counts that included conspiracy against the United States, conspiracy to launder money and unregistered agent of a foreign principal.

The charges do not cover any activities related to the campaign, though it's possible Mueller could add additional charges.

Manafort served as Trump campaign chairman, and he ran the Trump campaign for several months with Gates serving as his deputy. Gates stayed on the campaign after Manafort was ousted amid questions about his work in Ukraine. But Gates was ousted from a pro-Trump advocacy group earlier this year amid mounting questions about Manafort.

The pair's relationship goes back years. Gates joined Manafort's lobbying firm in the mid-2000s when he handled projects in Eastern Europe, including in Ukraine.

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