A bill that would have significantly bolstered the nation’s defenses against electoral interference has been held up in the Senate at the behest of the White House, which opposed the proposed legislation, according to congressional sources.The Secure Elections Act, introduced by Sen. James Lankford, R-Okla., in December 2017, had co-sponsorship from two of the Senate’s most prominent liberals, Kamala Harris, D-Calif., and Amy Klobuchar, D-Minn., as well as from conservative stalwart Lindsey Graham, R-S.C., and consummate centrist Susan Collins, R-Me.