By early Friday morning, President Donald Trump was back on Twitter. He tweeted about U.S. relations with Iran and Australia, “radical Islamic terrorist” and “Yes, Arnold Schwarzenegger.” Just the day before, the president had already tweeted that “Iran has been formally PUT ON NOTICE for firing a ballistic missile.” And he questioned if government financial aid should stop for a California university where protesters prevented a Breibart News editor from speaking. Trump, entering his third week as president, is tweeting often just as he did during his successful campaign for president. His frequent postings on Twitter are raising questions. Some want the White House to keep all of Trump’s tweets as part of the official administration records to be turned over after he leaves office. Others worry his Twitter account can be “hacked,” while some question if his tweets will make it difficult for him to govern.