Trump campaign unveils ‘Pencil-neck Adam Schiff' t-shirts for sale

(FOX NEWS) -- President Donald Trump is taking his displeasure with U.S. Rep. Adam Schiff, D-Calif., a step further with the sale of "Pencil-Neck Adam Schiff" t-shirts.

The term stems from a Trump campaign rally held Thursday in Grand Rapids, Mich., where the president blasted the House Intelligence Committee chairman over his Trump-Russia collusion claims. The tee features Schiff with a pencil for a neck and sells for $28, according to a tweet from the campaign website.

"Little Pencil-Neck Adam Schiff He spent two years knowingly and unlawfully lying and leaking. He should be forced to resign from Congress! Everyone should buy a Pencil-Neck Adam Schiff shirt today!," the tweet reads.

Trump and Republicans have called for Schiff to resign in the wake of Attorney General William Barr's letter summarizing Special Counsel Robert Mueller's report on the Trump-Russia probe.

Barr wrote that Mueller did not find collusion. On obstruction, the Mueller report allegedly laid out evidence but did not make a finding implicating Trump or exonerating him. That move effectively punted the obstruction question to Congress, where Democrats control the House and Republicans run the Senate.

Schiff was defiant on Monday, repeating his assertion that evidence of collusion is in "plain sight." He said he accepts Mueller's conclusion that he could not prove a criminal conspiracy with Russia, but said his committee's investigative work will go on.

Attorney General William Barr plans to submit a redacted version of Mueller's report to lawmakers by "mid-April, if not sooner."

The Associated Press contributed to this report.