The toys could be a sign of some Republicans' disdain for the Democratic presentation against Trump.
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Fidget spinners have become especially popular in recent years, and they have prompted a collection of YouTube videos on how to perform tricks. The fidget spinners, which are sold for a couple of dollars each, have been promoted as toys that can reduce anxiety and help users focus.
Burr played with a blue one while listening to arguments by Rep. Jerry Nadler, D-N.Y., one of the impeachment managers.
Sen. Tom Cotton, R-Ark., was spotted with a purple one on his desk, and later Thursday he was seen playing through the entirety of arguments against Trump from Rep. Zoe Lofgren, D-Calif., frequently making gestures and playfully chuckling with Sen. Joni Ernst, R-Iowa.
Sen. Pat Toomey, R-Pa., had a white one on his desk, although he wasn't seen playing with it.
Rand Paul, R-Ky., appeared to be drawing or tracing a sketch of the U.S. Capitol, and Marsha Blackburn, R-Tenn., was spotted reading a book and underlining a passage in it.
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Twiddling with fidget spinners might be a violation of Senate rules that senators must sit silently and listen to arguments during an impeachment trial, but it wouldn't be the first time during the first days of the trial that senators have appeared to break the rules.
During Wednesday's proceedings, some senators milled around during arguments by the lead impeachment manager, Rep. Adam Schiff, D-Calif., and Paul was spotted with a crossword puzzle hidden in his papers. There also appeared to be a Sudoku game on the page. Others, however, paid close attention and took careful notes.
Garrett Haake is a Washington-based correspondent for MSNBC.
Leigh Ann Caldwell
Leigh Ann Caldwell is an NBC News correspondent.
Heidi Przybyla is an NBC News correspondent.
Adam Edelman is a political reporter for NBC News.