Washington (CNN) President Donald Trump and his legal team have taken issue with some of the questions from special counsel Robert Mueller that cover the transition period after the 2016 election, believing it could be off limits under executive privilege as they pertain to the presidency, according to a source familiar with the negotiations.

The source would not explicitly say whether the President answered those questions other than to say that there are "responses" to all of the questions that were asked.

Trump's lawyers had previously made the case to Mueller's team that the President would only answer questions related to collusion about events that took place before the 2016 election.

In an interview with The Washington Post Thursday , the President's attorney Rudy Giuliani alluded to the sticking point with the questions, saying, "There are some that create more issues for us legally than others."

The source would not say if the concerns have been conveyed to Mueller's team.

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