Sen. Ted Cruz, R-Texas, is unhappy that the Washington Post published a cartoon this week that portrayed his daughters as monkeys, and he continued his criticism Wednesday by referring to the newspaper as a "lapdog" of the Democratic Party.

"Seems like a better idea for a cartoon: Hillary and her lapdogs," the Texas senator said in a tweet.

The tweeted message depicted Democratic front-runner Hillary Clinton walking two dogs. The first dog is labeled "The Washington Post," and the second dog is labeled "The New York Times."

The tweet comes after the Post's Ann Telnaes declared Tuesday that Cruz's daughters, Caroline, 7, and Catherine, 5, are "fair game" after they appeared with their father in a Christmas-themed video.

Telnaes followed up with this statement by publishing a cartoon depicting the 2016 GOP presidential candidate as an organ grinder and his two young daughters as dancing monkeys.

"There is an unspoken rule in editorial cartooning that a politician's children are off-limits. People don't get to choose their family members so obviously it's unfair to ridicule kids for their parent's behavior while in office or on the campaign trail — besides, they're children," Telnaes wrote in a now-deleted article Tuesday.

"But when a politician uses his children as political props, as Ted Cruz recently did in his Christmas parody video in which his eldest daughter read (with her father's dramatic flourish) a passage of an edited Christmas classic, then I figure they are fair game," she added.

The Post later deleted Telnaes' cartoon from its website, and an editor issued a statement explaining that he hadn't actually reviewed her work prior to publication.

"It's generally been the policy of our editorial section to leave children out of it," Post editor Fred Hiatt said in a statement late Tuesday evening. "I failed to look at this cartoon before it was published. I understand why Ann thought an exception to the policy was warranted in this case, but I do not agree."