Milli-nukes and Micro-nukes

The .01 kiloton (kt) TNT equivalent is about 1/1000th of the Hiroshima (20KT) blast. And here is a government scientist, Peter Leitner (see below report), PhD, speaking to a Congressional Committee, in 1998.
This is proof of nuclear bombs down into the range of “several pounds of TNT.”
He stated, “These experiments involve the ACTUAL TESTING of extremely low-yield fission devices (as low as the equivalent of several pounds of TNT) within a confined environment.”
Several pounds of TNT is equivalent to about 1/10,000,000th (one ten millionth) of the Hiroshima blast. Thus the U.S. Government admitted having micro-nukes, and beyond in 1998. Note that this public admission stated that the testing was done “in a controlled environment.”
Clearly, the government has had milli-nukes and micro-nukes for some time.