WASHINGTON -- The Chicago Cubs have decided not to move forward with their protest of Saturday's 5-2 loss to the Nationals.

Cubs manager Joe Maddon had argued that Washington reliever Sean Doolittle used an illegal delivery in the ninth inning of the game and said that he was playing under protest. The Cubs then had 24 hours to submit an official grievance to the league, but they decided not to.

The double toe-tap Doolittle appeared to use as he delivered the ball to home plate has been deemed illegal in the past, but umpires on Saturday did not force the left-hander to alter his delivery, much to Maddon's dismay.

"You're trying to delineate what is right and what is wrong. In my mind it wasn't a judgment call. I thought it was black and white," Maddon said Sunday.

Maddon came out to argue after Doolittle's first pitch of the ninth inning -- a strike to pinch hitter Albert Almora Jr. Although the umpires huddled with each other, and then with Doolittle, they sided with the lefty while deeming his delivery OK.

"[Maddon] thought he was tapping his foot, which in itself is not illegal, and this all kind of stems from his pitcher being called on something that was a little bit different than what Doolittle was doing," crew chief Sam Holbrook said. "So in our judgment, Doolittle did nothing illegal at all."

Holbrook was referring to Cubs reliever Carl Edwards Jr., who was told in the second game of the season that he couldn't do his version of the double toe-tap. Recently, Mariners pitcher Cory Gearrin was also forced to change his delivery after warming up mid-inning. But after some deliberation the Cubs decided not to protest.

"I really didn't anticipate whole lot to be done with it even though I still don't agree with the conclusion because I think it's exactly what Carl did just a different version of it," Maddon said.

"I would not be a good parent had I not spoken up for my guy (Edwards)," Maddon added.

Maddon lodged his protest with one out in the ninth inning. If the Cubs had officially protested to the league and won, the teams would have picked up the game from that point, as Doolittle retired the next two batters to earn the save.

After the game, Doolittle was having none of what Maddon was trying to sell.

"In that moment, he's not doing anything other than rattle me," Doolittle told reporters, according to an mlb.com report. "It was kinda tired. Sometimes he has to remind people how smart he is."