Over the past few years I have often heard people repeat the word "is" unnecessarily, for example, "My concern is, is that by going backwards we will throw a spanner in the works and that momentum will be halted." (Sir Michael Wilshaw, Chief Inspector of Schools, Radio 4 Today Programme, 9th September 2016.)
Sometimes, as in the above example, there is a discernible pause between the two words, and sometimes there is none.
Has this phenomenon been remarked upon and does it have a name? If not, may I suggest "isisism".