Bernie Sanders has urged supporters not to demonstrate on the floor of the Democratic National Convention.

He sent out text messages and emails with his personal request.

Sanders is characterizing the request “as a personal courtesy to me” and urging his followers to “not engage in any kind of protest on the floor.”

The Vermont senator says it is of the “utmost importance” that this be explained to the state delegations.

Sanders say “our credibility as a movement will be damaged by booing, turning of backs, walking out or other similar displays.”

The challenger to Hillary Clinton is speaking later Monday at the Philadelphia convention.

It comes as many of his supporters contend the Democratic National Committee failed to be neutral during the primaries.