Michael G. Flynn, the son of President Donald Trump’s ousted national security adviser, lashed out on Wednesday at his father’s replacement, who he suggested was not as “loyal” to the President.

Flynn suggested that his father, Michael Flynn, and White House chief strategist Steve Bannon were more “loyal” to Trump than National Security Adviser H.R. McMaster.

He also claimed that McMaster won’t use the phrase “radical Islam” and, apparently on that basis, questioned whether the White House is “serious” about defeating “our enemy.”

Fact 1: Flynn/Bannon most loyal to DJT (both out at NSC) Fact 2: McMaster wont say “Radical Islam” Is WH serious abt defeating our enemy? https://t.co/XkzfHJRksx — Michael Flynn Jr🇺🇸 (@mflynnJR) April 5, 2017

Michael Flynn Jr. was reportedly fired from Trump’s transition after spreading unsubstantiated conspiracy theories, including posts related to “Pizzagate,” on social media.

He apparently deleted his Twitter account in January after referring to the executive order Trump signed banning refugees and immigrants from certain countries from entering the United States as a “Muslim ban.”

Michael Flynn Jr.’s father resigned as national security adviser in February days after reports revealed that he spoke about sanctions in a call with Russia’s ambassador to the United States before Trump’s inauguration. Michael Flynn Jr. returned to Twitter a day later with the claim that his father’s ouster was the result of a “disinformation campaign.”

Trump appointed McMaster to fill the vacancy. Days later, McMaster reportedly told an all-staff National Security Council meeting that the phrase “radical Islamic terrorism” was not helpful in the fight against terrorism.

Bannon was removed from his position on the council on Wednesday. NBC News’ Kristen Welker reported, citing unnamed sources, that Bannon was appointed to the council specifically to keep an eye on Flynn.