What did Larry Summers think about unemployment insurance before he started working for the Obama admin?

Library of Economics and Liberty:

Unemployment insurance also extends the time a person stays off the job. [Kim] Clark and I estimated that the existence of unemployment insurance almost doubles the number of unemployment spells lasting more than three months. If unemployment insurance were eliminated, the unemployment rate would drop by more than half a percentage point, which means that the number of unemployed people would fall by about 750,000. This is all the more significant in light of the fact that less than half of the unemployed receive insurance benefits, largely because many have not worked enough to qualify.