From the Nikkei today on the BOJ response to Trump’s comments:
"I have no idea what he is saying," said one baffled BOJ official
– While Bank of Japan officials see no grounds for Donald Trump’s accusation of currency devaluation … "We may have had trouble instituting yield curve controls if we had tried to do so after Trump took office"
On that last point – yes, divergences in policy like this can account for divergences in currency prices. This something the US Prez. will have to consider when trying to manipulate the value of the USD.