WATCH: Joy Reid royally smacks down Trump backer accusing Planned Parenthood of practicing eugenics
MSNBC host Joy Reid listening patiently to Alphonso Aguilar -- (MSNBC screen grab)

MSNBC host Joy Reid took another conservative to the woodshed Saturday, shutting down a Trump backer who attempted to make the case that liberals have conspired with Planned Parenthood to practice eugenics in black communities.

Calling it a "smear," the AMJoy host brought the conversation to a screeching halt when Trump supporter Alfonso Aguilar, executive director of the Latino Partnership for Conservative Principles, attempted to defend tweets by Donald Trump, including retweets from white nationalist Twitter accounts.

"He does control his own Twitter account, and he is retweeting white nationalists," Reid told Aguilar. "Which, if you’re following them, they’re somehow in the stream of your social media"

"I think I could argue that is a double standard," Aguilar replied, with Reid shooting back, "That is not a double standard."

"Margaret Sanger, let's talk about Planned Parenthood" Aguilar blurted, with Reid reminding him,"You're mentioning a dead person, gone for many decades."

Holding up her finger, Reid told her guest, "Planned Parenthood is not a eugenicist organization. And I think that is incredibly offensive. Planned Parenthood is a health organization. Good gracious."

Aguilar was not deterred, saying, "52 percent of all abortions are performed on Latino and African-Americans--" as Reid shut him down for the last time.

"Okay, I think that smear on Planned Parenthood cannot go forward and we are not going to continue with that line of questioning, " she said as she pulled the plug on the interview.

Watch the video below via YouTube: