President Barack Obama's Oval Office address to the country Sunday did little to impress one of his loudest critics in the race to replace him.<br />In a rare prime-time speech, Obama called the shootings in San Bernardino, California, an "act of terrorism."<br />He prodded Congress to adopt new restrictions on assault weapons and ban people who are on no-fly lists from purchasing firearms.<br />And he urged Americans against associating terrorism with all Muslims - even as he said that extremism in some communities is "a real problem that Muslims must confront without excuse."<br />GOP presidential front-runner Donald Trump, who had promised to live-tweet the speech, came to the quick conclusion, "We need a new President - FAST!"<br />The real estate mogul had little else to say other than, "Is that all there is?"<br />In other tweets, Trump excused Obama for reading a prepared speech off of a teleprompter, but said he hoped Obama wouldn't criticize Second Amendment gun rights.