It would make Denmark Strait... "interesting".
I suggest this book,
Butler, J. R. M. (1971) [1957]. Grand Strategy: September 1939 – June 1941. History of the Second World War United Kingdom Military Series. II (2nd ed.). HMSO. ISBN 978-0-11-630095-9. (pp 217-218.)
, to those who are upset about
Mers el Kebir. the French ADM
Marcel-Bruno Gensoul was actually given "option orders" to steam to the United States and turn over his ships to the Americans for internment. Admiral Darlan gave him those orders. (See citation above.)
The "irony" is that we now know ADM Darlan gave Gensoul that option he could use independently in case a Mers el Kebir ever came up. The hello of it, was that the British gave Gensoul the same option (Somerville) and the confusion in the tragedy was that when Gensoul radioed Darlan for final instructions; he, Gensoul, omitted to mention that option in his communique. So, when Darlan failed to issue clear instructions in time, Gensoul, still could have sailed forth to the French Martinique anchorage or to Norfolk.
Gensoul chose poorly.