President Donald Trump's planned "great, great wall" began morphing into a physical barrier and an array of high-tech gadgets in congressional talks launched on Wednesday to forge a compromise on security at the U.S. border with Mexico.

Although there were no guarantees a deal could be reached by a Feb. 15 deadline, lawmakers on both sides showed a willingness to avoid ultimatums and seek common ground.

Some negotiators from Trump's Republican Party avoided uttering the word "wall" during the 17-member border security panel's first session on Wednesday. They spoke of a mix of enforcement tools, as Democrats had urged.