Article snippet: In a dramatic round of interviews former Trump adviser Sam Nunberg appeared on cable television on Monday to announce his intention to defy a special counsel subpoena to appear before the grand jury this week. Nunberg met with special counsel Robert Mueller’s team earlier this month for a closed-door interview for a conversation described at the time, according to a source with direct knowledge, as focusing on Nunberg’s time working for then businessman Donald Trump. Nunberg, during his multiple cable news appearances on Monday, also alluded to possible wrongdoing on President Trump’s part during the campaign, saying then-candidate Trump “may have done something during the election.” The White House pushed back against his claims. "As we've said many times before, there was no collusion with the Trump campaign," White House press secretary Sarah Sanders said on Monday. "Anything further on what his actions are, he hasn't worked at the white house, so I certainly can't speak to him or the lack of knowledge that he clearly has. Nunberg’s brief time on the Trump campaign ended in August 2015 when he was fired after multiple racially charged Facebook comments were discovered on his personal account. The posts even included a slur directed at former President Barack Obama. In the summer of 2016, Trump sued Nunberg for $10 million violating a non-disclosure agreement by leaking confidential information about the campaign to the media. Nunberg de... Link to the full article to read more