I'll say difficult explain...Like the clouds around Zeewoe's Selective Service Registration, applications & records to/at Occidental, Columbia, HLS, previous IRS tax records & states of residence, travel to Pakistan in 1981, long form birth certificate, violation of US/Senate law stumping for uncle Odinga in Kenya in 2006 as a US Senator, bypassing Congress to blow up Libyan ground troops, 90 days vacation in 2 yrs as TOTUS (unheard of)...lots of stuff that is difficult to explain as to clarification from promised transparency of the current admin.
Why is it you suppose??