Is there any truth in that the Americans wanted TSR-2 cancelled? As it was so advanced for it's time that the Americans feared the Soviets would improve their air defences. Therefore America would have lost its supremacy.
I suppose cancelling the TSR-2 also removed a competitor for their F-111 exports too.
No, it isn't clear that the US wanted to kill TSR-2. Yes, some additional sales of TFX (F-111) would be welcome, but in 1965 the F-111 programme still encompassed the F-111B carrier fighter (which had first flight in May 65, after TSR-2 was cancelled), and was slated for an enormous production run, with commonality driving down production costs and maximising R&D return (see: JSF).
The US offered the RAAF F-111C on terms that the UK couldn't match - because the benefits of scale were so profound - and that knocked 30 out of a total TSR-2 projected build of 180. It's worth recalling that even after TFX went horribly wrong, the USN cancelled the F-111B and F-111D was built in tiny numbers, that they still built 550+ F-111s.
The interesting counterfactual - which in fairness to Dennis Healey couldn't possibly have been foreseen in April 1965 - was that if TSR-2 had continued, and *if* it had had a trouble-free development (which given the complexity of the Nav/Attack system was by no means a certainty), and had successfully entered squadron service by 1970, then by 1968/69 when F-111 was in huge trouble - weight, engines, avionics, horizontal stabilisers falling off - would the USAF would have taken TSR-2 on a licence basis, as they would do with Harrier in the same timescale?
My hunch is "probably", given how effective TSR-2 could've been in SE Asia as well as in Europe, but there are an awful lot of "ifs" in this.
S41