(CNN) For the first time since taking office, President Donald Trump on Monday didn't tweet before 8:15 a.m. ET on a weekday.

Trump's time at the White House has been marked by a number of changes to the office of the presidency, but none may be more public than Trump's reliance on Twitter, especially early in the morning.

The President of the United States had tweeted before 8:15 a.m. ET every weekday morning since taking office, offering his take on negative polls, his replacement on NBC's "The Apprentice" and his unsubstantiated claims that "at least 3,000,000 votes were illegal" in the 2016 campaign.

White House aides say Trump's use of Twitter makes the President more accessible and open to the American people. But the practice also gets him in trouble, regularly stepping on the White House's message and possibly derailing a day of coverage.

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