Trump's two eldest sons sparked outrage over comments and social media posts 

Don Jr, 42, on Saturday posted a meme calling Joe Biden a pedophile 

Eric Trump told Fox News that Democrats are 'milking' COVID-19 to hurt his dad

He said his father was prevented from holding rallies in stadiums during crisis 

Don Jr on Sunday claimed he was joking, but then doubled down on claims 

He posted clips of Biden affectionately touching Congress members' daughters 

Don Jr said images showing Biden stroking young girls' hair are 'disturbing' 

Trump campaign released scathing ads, saying Biden was senile and too old