New York (CNN Business) The Campbell Soup lobbyist who said George Soros' foundation was assisting a caravan of migrants bound for the United States is no longer with the company.

Kelly Johnston, formerly Campbell's vice president of government affairs, tweeted on Monday that the Open Society Foundations arranged for "troop carriers" and "rail cars" to support the caravan, which formed earlier this month in Central America. Johnston has since deleted his Twitter account.

Campbell and Johnston had discussed his leaving over the summer, the company said on Saturday. Johnston was scheduled to leave in November, but the tweet sped up his exit.

"In the last few days, the company and Mr. Johnston have agreed that under the current circumstances it would be best to accelerate the timing of his departure," a company spokesperson told CNN Business. Thursday was his last day.

Johnston did not immediately respond to a request for comment from CNN Business.