The ‘most deadly adversaries of republican government,’ wrote Alexander Hamilton, arise ‘chiefly from the desire in foreign powers to gain an improper ascendant in our councils. How could they better gratify this, than by raising a creature of their own to the chief magistracy of the Union?’ Hamilton’s warning against ‘intrigue, and corruption’, published in 1788, speaks eerily to the Washington of today, where Donald Trump’s enemies imagine he is a Russian ‘agent of influence,’ bought or blackmailed by the Kremlin.