As one of the New York's most prominent real estate tycoons, Donald Trump is well aware that rent is going through the roof in Manhattan these days.

So he may not have been surprised when the owner the midtown Manhattan office space his campaign leases nearly quintupled the monthly fees- from $35,458 to $169,758 (£26,901-£128,790).

It is particularly unlikely that he was caught off guard given that the offices are in Trump Tower and that price-hiking landlord was, well, Donald Trump.

In the days when Mr Trump was self-funding his campaign he boasted of the shoe string budget on which it was run.