J.R. Smith could face discipline from the NBA if the league deems he threatened Pistons guard Brandon Jennings on Twitter.

Smith took exception to Jennings' tweet questioning whether his brother, Chris Smith, belonged in the NBA.

Jennings tweeted, "Wait wait wait JR Smith brother in the NBA but @POOHJETER & @BBROWNLAU isn't. Call me hater but not Rollin!!!" Jennings, who eventually removed that tweet, was referring to Pooh Jeter and Bobby Brown.

J.R. defended Chris and wrote he has "no respect" for "lil kids who pop at the mouth on twitter" and then "delete their tweets." Moments later, Smith tweeted, "Might call some of my Number street homies an put #Detroit on smash for a min! ?Serious."

The NBA was looking into the matter. Smith could face a fine or suspension. But Smith denied that it was a threat and didn't think it warranted any penalty.

"There's a way to threaten somebody and that's not the way to publicly threaten somebody," Smith said. "I really didn't think it was that big of a deal. Apparently it is."

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It wouldn't be the first time the league disciplined Smith for a tweet. He was fined $25,000 in 2012 for posting an inappropriate photo of a woman.

"I'm always in trouble with Twitter," Smith said. "I don't know what it is. I'm trying to shake it."

Smith admitted he was "definitely frustrated," because his brother continues to hear he's only on the Knicks because of J.R.

"You get tired of people trying to pick on your little brother," Smith said. "It's my little brother. I'm going to step up for him, good bad or ugly. So it's not just to Brandon. It's to anybody who says anything about him."

Mike Woodson talked to Smith about what happened before last night's game against the Rockets.

"My whole thing with that is if you're going to tweet, tweet something positive," Woodson said.

Later, Woodson said he might institute a policy in which players can't tweet.

Chris Smith never really got involved in the back-and-forth. He tweeted, "No twitter war for me." Jennings also tried to diffuse the situation, tweeting, "It's not beef. It's just basketball talk."

J.R. said he and Jennings play basketball together in the summer in Los Angeles.

The Knicks play at Detroit Tuesday.

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