I looked up Bullard's presentation online. He seems to give more attention to the trimmed mean of the personal consumption expenditure price index (PCEPI) as a measure of core inflation over the US Fed's preferred PCEPI ex food and energy (PCEPILFE) measure, although he does look at both. It seems odd in a sense as the PCEPILFE measure, which he calls core PCE, shows both lower inflation in April and a bigger drop in the inflation rate from December to April than the trimmed mean estimate, so would seem to better support his belief that the US Fed should delay its next rate increase.