Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Washington (CNN) The darkening storm over Russia is now looming over President Donald Trump's innermost circle. The intrigue now threatening to swamp Washington politics deepened on Monday when Trump's son-in-law and trusted adviser, Jared Kushner, offered to testify to senators about meetings with senior Kremlin officials -- including the head of a bank closely linked to President Vladimir Putin's government. And more revelations about a secret trip to the White House complex by House Intelligence Chairman Devin Nunes spurred claims by Democrats that he was in league with the President's aides to subvert his own panel's investigation into Moscow's alleged election meddling and ties to the Trump campaign.On Monday, Kushner volunteered to testifyLater in the week senators will weigh in 
 Question:Perhaps prompted by rising speculation about Russia, _ launched a Twitter barrage Monday night, possibly to distract attention from stories damaging to his White House by attacking a familiar target.

Donald Trump