In spite of the left's best efforts to defend Science Czar John Holdren from attack, his writings are simply indefensible. Read them for yourself (all quotations are taken from the book he co-authored with overpopulation terrormonger Paul Erlich, Ecoscience):
Why should the law not be able to prevent a person from having more than two children?" -p. 838Lest readers complain these passages are taken out of context, you may read the entire pages quoted at this website; you will find that there is no context to change the meaning of the above passages, and that they mean exactly what they appear to mean.
"Indeed, it has been concluded that compulsory population-control laws, even including laws requiring compulsory abortion, could be sustained under the existing Constitution if the population crisis became sufficiently severe to endanger the society." -p. 837
"One way to carry out this disapproval might be to insist that all illegitimate babies be put up for adoption—especially those born to minors, who generally are not capable of caring properly for a child alone." -p. 786
"The development of a long-term sterilizing capsule that could be implanted under the skin and removed when pregnancy is desired opens additional possibilities for coercive fertility control. The capsule could be implanted at puberty and might be removable, with official permission, for a limited number of births." -p. 787
"Perhaps those agencies, combined with UNEP and the United Nations population agencies, might eventually be developed into a Planetary Regime—sort of an international superagency for population, resources, and environment.... The Planetary Regime might be given responsibility for determining the optimum population for the world and for each region and for arbitrating various countries' shares within their regional limits. Control of population size might remain the responsibility of each government, but the Regime would have some power to enforce the agreed limits." -p. 942-3