Figures released by the commission also showed the Brexit Party spent the most money on campaigning.
The Chancellor has dismissed the claims.
Laura Alvarez said the NHS would have been better prepared for the coronavirus crisis if her husband had been in Downing Street.
The Labour leader also suggested he would have acted sooner if he had been PM.
Sir Keir is up against Rebecca Long-Bailey and Lisa Nandy to replace Jeremy Corbyn as opposition leader.
The Brexit-backing businessman had argued the law on inheritance tax on political donations breached his human rights under European law.
"They laughed at Noah until the rain started", he said.
Good to see that the Prime Minister is finally up to speed.
The Defence Secretary has said he is now recovered and was able to carry on working throughout.
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