(Credit: images72 via Shutterstock/Salon) In September President Donald Trump announced during his election campaign that he would guarantee six weeks of paid maternity leave for working mothers — the first time a Republican presidential candidate has made such a promise. But even if he keeps his word, such a policy may not help many new moms, according to a new study published in the American Journal of Public Health. Jay Zagorsky, an economist and research scientist at the Ohio State University, analyzed data from an employment survey given to 60,000 U.S.