"There's any number of complications," said Rep. Harold Rogers, R-Ky., former House Appropriations Committee Chairman, citing obstacles such as Indian reservations and national parks and forests.
Analysis: Trump's border wall faces reality check →
Speaker Paul D. Ryan, Wisconsin Republican, and Mr. Rogers said the administration should have started scrounging for extra funds weeks ago, after Senate Democrats filibustered to block a deal that included $1.1 billion to address the Zika outbreak.
Democrats blame Republicans for Obama administration's painful cuts to fund Zika trials →
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