President Trump is notorious for posting cryptic tweets. But this one just may take the cake.

After Senator Kirsten Gillibrand (D-NY) called on the president to step down amid sexual harassment allegations, Trump responded by calling her a “lightweight” and accused her of “begging” for campaign funds.

“Lightweight Senator Kirsten Gillibrand, a total flunky for Charles E. Schumer and someone who would come to my office ‘begging’ for campaign contributions not so long ago (and would do anything for them), is now in the ring fighting against Trump,” the president wrote. “Very disloyal to Bill & Crooked-USED!”

A screenshot of a Trump Tweet.

While no one is quite sure what Trump meant when he called Gillibrand a lightweight, some suggest that Gillibrand may have tried to seduce Trump while under the influence of alcohol. That would explain the extra emphasis he put on the word “begging” as well as his assertion that she would “do anything” for campaign contributions.

Indeed, even Sen. Elizabeth Warren found the tweet to be sexually suggestive, and accused President Trump of slut-shaming Gillibrand.

“Are you really trying to bully, intimidate and slut-shame @SenGillibrand? Do you know who you’re picking a fight with? Good luck with that, @realDonaldTrump. Nevertheless, #shepersisted,” Warren wrote.

A screen shot of a tweet written by Elizabeth Warren.

Anchor Katty Kay of BBC World News America also took to Twitter to defend Gillibrand. In a series of tweets, Kay said Trump’s assertions were “clearly sexual” and “demeaning to women.”

“What is so maddening about the Gillibrand tweet is that women can be smart, work hard, become Senator and STILL get sexual c**p thrown at us,” she wrote. “Enough.”

A screen shot of a tweet written by Katty Kay.

Trump has yet to elaborate on the specific meaning of his tweet. However, according to Open Secrets, a nonprofit that tracks campaign donations, Trump has given a total of $8,900 to Sen. Chuck Schumer (D-NY) and $5,850 to Gillibrand since 1996.

Clearly, at one point, there was some type of a working relationship between Gillibrand and Trump. Whether or not that relationship was sexual remains to be seen.