Biden is yet to hold a press conference in the six weeks since taking office
Obama held one 20 days after he was inaugurated and Trump after 27
On Wednesday he said he was open to taking questions from House Democrats
As soon as he said he was ready for a Q&A, the White House feed was cut
Kayleigh McEnany, Trump's press secretary, asked Tuesday: 'Where's Joe?'
Jen Psaki said: 'We look forward to holding a full formal press conference'